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‎Hermann Henri‎

Reference : 100123887

(1974)

‎Précis de physiologie - TOME 2‎

‎Masson 1974 388 pages in8. 1974. Broché. 388 pages.‎


‎couverture un peu défraîchie intérieur propre bonne tenue‎

Un Autre Monde - Val Couoesnon

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‎HERMANN STAUDINGER‎

Reference : RO60080118

(1941)

‎ORGANISCHE KOLLOIDCHEMIE. DIE WISSENSCHAFT, EINZELDARSTELLUNGEN AUS DER NATURWISSENSCHAFT UND DER TECHNIK, BD.93‎

‎FIRIEDRICH VIEWEG & SOHN. 1941. In-8. Cartonné. Etat d'usage, Couv. légèrement passée, Dos satisfaisant, Intérieur frais. 243 pages. Texte en allemand.. . . . Classification Dewey : 540-Chimie et sciences connexes‎


‎ Classification Dewey : 540-Chimie et sciences connexes‎

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‎Hermbstaedt, Sigismund Friedrich:‎

Reference : 2582CB

(1823)

‎Chemische Grundsätze der Kunst Branntwein zu brennen ... Nebst einer Anweisung zur Fabrikation der wichtigsten Liqueure.‎

‎2. (von 2) Band. Berlin, Carl Friedrich Amelang, 1823. 8°. VIII, 328 S. Mit 12 mehrf. gef. Kupfertafeln. Halblederband der Zeit.‎


‎Nur der zweite Band. - Ausgeschiedenes Exemplar des medizinhistorischen Instituts Zürich, mit Bibliotheksstempel. - Die Tafeln wasserrandig. Papier durchgehend etwas gebräunt, fleckig und angestaubt. Einband berieben und bestossen.‎

EOS Buchantiquariat Benz - CH-8001 Zürich
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CHF300.00 (€321.56 )

‎HERMBSTÄDT, SIGISMUND FREDERIK.‎

Reference : 27876

(1812)

‎Grundrids af den experimentale Kameral=Chemie for Kameralister, Agronomer, Forstbetientere og Technologer. Oversat af det Tydske ved J.F. Bergsøe.‎

‎Kbhvn., Brünnich, 1812. Samt. hldrbd. med rygforgyldning og skindtitel. Ryg lidt slidt, lille revne øverst i fals. Hjørner stødte. XIV,698 pp. Bogen har tilhørt Paul Bergsøe, og bærer hans navn på fribladet.‎


‎Første danske udgave af dette vigtige værk indenfor den kemiske teknologi. - Bibl. Danica II:147.‎

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‎Hermy M. Lambinon J. Van Der Veken P‎

Reference : 100101007

(1987)

‎Mycologia belgica 1986 - Actes du Colloque de Mycologie MONS 15.XI.1986 / mémoires de la société Royal de Botanique de Belgique VOLUME 9‎

‎Universa / Wetteren - Bruxelles-Brussel 1987 in4. 1987. Broché. iconographie en noir et blanc‎


‎proche du très bon état insolé sur le pourtour intérieur propre bonne tenue 4e plat marqué‎

Un Autre Monde - Val Couoesnon

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‎Hermy M. Lambinon J. Van Der Veken P‎

Reference : 100101006

(1988)

‎Septième colloque de l'association des diatomistes de langue française centre de recherche et d'éducation pour la conservation de la nature à Vierves-sur-Viroin 22-25.IX.1987‎

‎Universa / Wetteren - Bruxelles-Brussel 1988 in4. 1988. Broché. mémoires de la société Royal de Botanique de Belgique --- iconographie en noir et blanc‎


‎Très bon état couverture insolée sur son pourtour intérieur propre bonne tenue‎

Un Autre Monde - Val Couoesnon

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EUR47.00 (€47.00 )

‎HERPIN (Jean-Charles).‎

Reference : 17135

(1824)

‎Récréations chimiques ou Recueil d'expériences curieuses et instructives auxquelles on a joint un Précis élémentaire de chimie, l'explication raisonnée des phénomènes produits dans les diverses expériences, enfin, leurs applications à l'économie domestique ou aux arts.‎

‎ Paris, Audot, 1824. 2 vol. au format in-8 (203 x 128 mm) de 2 ff. n.fol., iv - 384 pp. ; 304 pp. et 4 planches dépliantes in fine. Reliures uniformes de l'époque de demi-basane glacée aubergine, dos lisses ornés de doubles filets dorés, titre doré, tomaison dorée, toutes tranches mouchetées.‎


‎ Edition originale rare. Ensemble complet de ses deux volumes ainsi que de ses 4 planches dépliantes gravées. ''C'est dans le dessein de rendre la science chimique familière et agréable que nous avons fait un choix d'expériences curieuses et récréatives, propres à démontrer les procédés les plus importants de la chimie. Nous avons ajouté à la fin de chaque expérience une explication raisonnée afin d'intéresser l'esprit et de mettre le praticien à même d'observer avec fruit les phénomènes qui se passent sous ses yeux et d'en apprécier les relations et les conséquences. Nous avons ici inséré un recueil d'amusements chimiques''. Duveen, Biblioteca alchemica et chemica, p. 292 - Absent de Ferguson, Biblioteca chemica - Quérard IV, La France littéraire, p. 96. Dos légèrement insolés. Page de titre du second volume absente. Feuillets parfois légèrement brunis (toutefois davantage marqués sur deux cahiers). Inégales rousseurs dans le texte. Du reste, belle condition. Rare. ‎

Babel Librairie - Périgueux
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‎"HERSCHEL, JOHN W.F.‎

Reference : 54345

(1840)

‎On the Chemical Action of the Rays of the Solar Spectrum on Preparations of Silver and other Substances, both metallic and non-metallic, and on some Photographic Processes. Received and Read Febrauray 20, 1840. (+) Note I- (III).- On the Distribution ... - [INTRODUCING 'POSITIVE' AND 'NEGATIVE' IN PHOTOGRAPHY]‎

‎(London, Richard and John E., Taylor, 1840. 4to. No wrappers as extracted from ""Philosophical Transactions"" 1840 - Part I. Pp. XII [including title-page of Philosophical Transactions"" 1840 - Part I), 59 pp. (Note I- III pp. 51-59) and 2 plates. (one showing Herschel's telescope, lithographed"" the other showing the heat spectrum of the sun in stipple engraving).‎


‎First appearance of an important pioneer-paper in the history of early photography, in which subject John Herschel was one of the main contributors. The paper deals with the dynamical interplay between photochemistry and photography and is of the greatest importence in applied photography. The later sections of the paper deals with the spectrum of the sun, Herschel's so-called thermographical representation of the spectrum of the sun (with description of the Actinograph, invented by him), rendering the heat radiation visible in the spectrum. This first importent spectrum is reproduced here on one of the plates (in stipple engraving). In this paper he introduces the photographical concepts 'positive' and 'negative' to express, respectively, pictures in which the lights and shades are the same as in nature, or as in the original model, and in which they are opposite.For this large paper John Herschel was awarded the Copley archives winners Prize for 1840.""The object which the author has in view in this memoir is to place on record a number of insulated facts and observations respecting the relations bothof white light, and of the differently refrangible rays, to various chemical agents whic have offered themselves to his notice in the course of his photographical experiments, suggested by the announcement of M. Daguerre's discovery.....The terms ""direct"" and ""reverse"" are also used to express pictures in which objects appear, as regards right and left, the same as in the original, and the contrary....The principal objects of inquiry in the present paper...are the following. First, the means of fixing photographs, the comparative merits of different chemical agents...The means of taking photographic copies and transfers.....The preparation of photographic paper....The chemical analysis of the solar spectrum forms the subjects of the next section in the paper...""(Abstract).‎

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‎"HERSCHEL, JOHN W.F. - DISCOVERY OF PRUSSIAN BLUE IN PHOTOGRAPHIC PROCESSES.‎

Reference : 42843

(1842)

‎On the Action of the Rays of the Solar Spectrum on Vegetable Colours, and on some new Photographic Processes. Received June 15, - Read June 16, 1842.‎

‎(London, Richard and John E., Taylor, 1842.). 4to. No wrappers as extracted from ""Philosophical Transactions"" 1842 - Part II. Pp. 181-214 and one double-page folded engraved plate.‎


‎First appearance of a pioneer-paper in the history of early photography in which Herschel announced some of his importent discoveries of the photographic printing processes, the process of photographic contact-printing in Prussian blue, brought to light just three years after Louis Daguerre and Henry Talbot had announced their independent inventions of photography in silver, using metal and paper substrates, respectively. and the photographic properties of red ferro sesquicyanuret of potassium.""This is the first recorded observation of Prussian blue being formed for a photographic purpose by the action of light on potassium ferricyanide, so it represents the moment of discovery of the first cyanotype process, although this name still lay in the future. The significance of this observation impressed Herschel sufficiently to mention it also in his general diary entry for 23 April 1842....""(Mike Ware in ""John Herschel's Cyanotype. Invention or discovery ?"").‎

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‎"HERSCHEL, JOHN W.F. - INTRODUCING 'POSITIVE' AND 'NEGATIVE' IN PHOTOGRAPHY.‎

Reference : 42304

(1840)

‎On the Chemical Action of the Rays of the Solar Spectrum on Preparations of Silver and other Substances, both metallic and non-metallic, and on some Photographic Processes. Received and Read Febrauray 20, 1840. (+) Note I- (III).- On the Distribution ...‎

‎(London, Richard and John E., Taylor, 1840. 4to. No wrappers as extracted from ""Philosophical Transactions"" 1840 - Part I. Pp. 1-59. (Note I- III pp. 51-59) and 2 plates. (one showing Herschel's telescope, lithographed"" the other showing the heat spectrum of the sun in stipple engraving).‎


‎First appearance of an important pioneer-paper in the history of early photography, in which subject John Herschel was one of the main contributors. The paper deals with the dynamical interplay between photochemistry and photography and is of the greatest importence in applied photography. The later sections of the paper deals with the spectrum of the sun, Herschel's so-called thermographical representation of the spectrum of the sun (with description of the Actinograph, invented by him), rendering the heat radiation visible in the spectrum. This first importent spectrum is reproduced here on one of the plates (in stipple engraving). In this paper he introduces the photographical concepts 'positive' and 'negative' to express, respectively, pictures in which the lights and shades are the same as in nature, or as in the original model, and in which they are opposite. For this large paper John Herschel was awarded the Copley archives winners Prize for 1840.""The object which the author has in view in this memoir is to place on record a number of insulated facts and observations respecting the relations bothof white light, and of the differently refrangible rays, to various chemical agents whic have offered themselves to his notice in the course of his photographical experiments, suggested by the announcement of M. Daguerre's discovery.....The terms ""direct"" and ""reverse"" are also used to express pictures in which objects appear, as regards right and left, the same as in the original, and the contrary....The principal objects of inquiry in the present paper...are the following. First, the means of fixing photographs, the comparative merits of different chemical agents...The means of taking photographic copies and transfers.....The preparation of photographic paper....The chemical analysis of the solar spectrum forms the subjects of the next section in the paper...""(Abstract).‎

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‎"HERSCHEL, JOHN W.F. - THE DISCOVERY OF THE IRON-PRINTING PROCESS.‎

Reference : 42662

(1843)

‎On certain Improvements on Photographic Processes described in a former Communication, and on the Parathermic Rays of the Solar Spectrum. Received November 17, - Read November 17, 1842.‎

‎(London, Richard and John E., Taylor, 1843. 4to. No wrappers as extracted from ""Philosophical Transactions"" 1843 - Part I. Pp. 1-6.‎


‎First appearance of a pioneer-paper in the history of early photography, as Herschel here for the first time describes his discovery of the iron printing process with ammonio-citrate of iron by both methods, namely with blue lines on a white background and white lines on a blue ground.‎

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‎HERS H.G.‎

Reference : W75890

(1957)

‎Le métabolisme du fructose‎

‎Bruxelles, Editions Arscia 1957 200pp.avec ills. + 1p. "thèses accessoires", 24cm., signé avec dédicace par l'auteur, br., bon état, [thèse d'agrégation de l'enseignement supérieur; Université Catholique de Louvain, Laboratoire de Chimie Physiologique], W75890‎


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EUR40.00 (€40.00 )

‎HERZBERG (G.)‎

Reference : 2661

‎Molecular spectra and molecular structure. I. Spectra of diatomic molecules‎

‎N.Y., Van Nostand, 1951, un volume in 8 relié en pleine toile éditeur, (cachets de bibliothèque), 15pp., 658pp.‎


‎---- Deuxième édition, deuxième impression ---- "Assistant à l'Institut de technologie de Darmstadt, chassé d'Allemagne par le régime nazi, G. Herzberg va occuper en 1935 une chaire de physique à l'université de Saskatchewan (Canada) puis, en 1945, une chaire de spectroscopie à l'observatoire Yerkes de Chicago. Il consacre sa carrière à l'étude de la spectroscopie des atomes et des molécules, qui lui permet de déterminer la structure électronique et la géométrie de diverses molécules diatomiques et polyatomiques, ainsi que d'un certain nombre de radicaux libres. Il utilise ces méthodes pour identifier divers radicaux ou molécules dans l'atmosphère des planètes et des comètes, ainsi que dans l'espace interstellaire. Il reçut le prix Nobel de chimie en 1971"**2661/M5AR‎

Phone number : 01 43 25 51 73

EUR25.00 (€25.00 )

‎HERZBERG, GERHARD.‎

Reference : 41339

(1936)

‎Atomspektren und Atomstruktur. Eine Einführung für Chemiker, Physiker und Physikochemiker. EA! (= Wissenschaftliche Forschungsberichte Naturwissenschaftliche Reihe, hrsg. von R. Ed. Liesegang, Band 37).‎

‎Dresden / Leipzig: Theodor Steinkopff, 1936. Orig. full cloth, cloth on spine loose, slightly soiled. Internally clean. XV, 191 pp. Illustr.‎


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DKK450.00 (€60.35 )

‎[Verlag von Theodor Steinkoff, Verlag von Wilhelm Knapp, Librairie Bernard Tignol] - ‎ ‎HERZOG, Prof. Dr. Aloïs ; BECKER, Franz ; WILLEMS, Polidor‎

Reference : 63770

(1910)

‎[ 3 Titles in 1 Volume : ] Die Unterscheidung natürlichen und künstlichen Seiden [ With : ] Die Kunstseide [ With : ] La Soie artificielle. Cellulose et fabrication de la soie artificielle‎

‎1 vol. in-8 reliure demi-percaline verte, Die Unterscheidung natürlichen und künstlichen Seiden, von Prof. Dr. Alois Herzog, Verlag von Theodor Steinkoff, Dresden, 1910, 78 pp. [ With : ] Die Kunstseide, von Dr. Phil. Franz Becker, mit 142 in den Text gedruckten Abbildungen, Druck und Verlag von Wilhelm Knapp, Halle a. S., 1912, 368 pp. [ With : ] La Soie artificielle. Cellulose et fabrication de la soie artificielle, Librairie Bernard Tignol, Paris, s.d. [circa 1905 ] 96 pp. ‎


‎Good copy. Bon exemplaire‎

Phone number : 09 82 20 86 11

EUR95.00 (€95.00 )

‎HERZ, W.‎

Reference : 29824

(1916)

‎Grundzüge der Geschichte der Chemie. Richtlinien einer Entwicklungsgeschichte der allgemeinen Ansichten in der Chemie.‎

‎Stuttgart, Enke, 1916. Cont. hcloth. Orig. wrappers pasted on frontboard. With stamps. Lower part of back taped. VI,142 pp.‎


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DKK250.00 (€33.53 )

‎HERZ (W.)‎

Reference : 2660

‎Les bases physico-chimique de la chimie analytique. Traduit de l'allemand par E. Philippi -- PREMIERE EDITION FRANCAISE‎

‎P., Gauthier-Villars, 1909, un volume in 8 relié en cartonnage éditeur, 6pp., 167pp.‎


‎---- PREMIERE EDITION FRANCAISE**2660/o6de‎

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EUR45.00 (€45.00 )

‎HERZ W.‎

Reference : W77214

(1898)

‎Ueber die wichtigsten Beziehungen zwischen der chemischen Zusammensetzung von Verbindungen und ihrem physikalischen Verhalten‎

‎Stuttgart, Ferdinand Enke 1898 pp.233-296, softcover, 25cm., Good condition, in the series "Sammlung Chemischer und chemisch-technischer Vorträge" III.Band Heft 7-8, W77214‎


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‎Herçay‎

Reference : R100067443

(1924)

‎Nettoyage, détachage, dégraissage, blanchiment, blanchissage - Nouvelle collection de recueils de recettes traditionnelles - 2e édition entièrement refondue.‎

‎H.Desforges. 1924. In-12. Broché. Etat passable, 1er plat abîmé, Dos abîmé, Papier jauni. 308 pages - 1er plat absent - coiffe en pied absente - coiffe en tête abîmée - manque une partie du dos - 2eme plat tâché et jauni - tampon sur le 2eme plat.. . . . Classification Dewey : 540-Chimie et sciences connexes‎


‎ Classification Dewey : 540-Chimie et sciences connexes‎

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‎[Verlag von Ferdinand Enke] - ‎ ‎HESSE, Prf. Dr. A. ; GROSSMANN, Prof. Dr. H.‎

Reference : 63690

(1917)

‎Englands Handelskrieg und die Chemische Industrie. Neue Folge : England. Frankreich. Amerika‎

‎1 vol. in-8 reliure demi-percaline marron, Verlag von Ferdinand Enke, Stuttgart, 1917, 344 pp.‎


‎Good condition (binding slighlty rubbed, a few foxing, ex-libris J.P. Folchi)‎

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EUR75.00 (€75.00 )

‎HESS, Filipp:‎

Reference : 26225aaf

‎Die Naturwissenschaften im Dienste des Krieges. Text- und Tafelband.‎

‎Wien, L.W. Seidel (für K.K. Kriegsschule), 1878, in-4° et in-4° oblong, XVI + 426 S. / 22 Tafeln davon 20 lithogr. Tafeln mit zahlr. gestoch. Fig. (Tafel 1 mit Stempel und staubfleckig), 1 Lichtdrucktafel, und 1 Karte in photolithogr. Farbendruck, im Mitte gefalten, einige Stempel, Original-Broschüre, fleckig, Stempel und Etikette / broschiert, Titeletikette uaf Umschlag vorne, Umschlag etwas beschädigt.‎


‎Zum Gebrauch an der K.K. Kriegsschule und zum Selbstunterricht fèr Offiziere aller Waffen. Das Werk ist abgeteilt in folgenden Hauptabschnitten: 1) Aëromechanik. / 2) Optik. / 3) Elektrizitäts-Lehre. / 4) Wärmelehre. / 5) Chemie der Fäulniss und Gährung.Filipp Hess war Hauptmann im k.k. Geniestabe. ‎

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(SLACES, NVVA)

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‎"HESS, (GERMAIN HENRY). - ANNOUNCING ""THE LAW OF HEAT FORMATION""‎

Reference : 48828

(1840)

‎Recherches sur les quantités de chaleur dégagées dans les combinaisons chimiques. Lettre de M. Hess à M. Arago.‎

‎(Paris, Bachelier), 1840. 4to. No wrappers. In: ""Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences"", Tome X, No. 19. Pp. (721-) 775 (entire issue offered). Hess' paper: pp. 759-763. A few scattered brownspots.‎


‎First apperance of the announcement of Hess' newly discovered law, known as Hess's Law, in form of a letter to Arago. ""Here thermochemistry received its first importent advance at the hands of Germain Hess, who showed that the heat evolved in a reaction is the same regardless of whether the reaction is carried out directly or in a number of steps..."" (Leicester & Klickstein ""A Source Book in Chemistry"", pp. 329-332). This announcement preceded the larger paper published the same year in ""Annales de Chimie et de Physique"" and the original (and larger) paper in ""Bulletin scientifique, Academie impériale des Sciences (St. Petersbourg)"". Parkinson ""Breakthroughs"" 1840 C.‎

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‎HESS, (GERMAIN HENRY). - HESS' S LAW.‎

Reference : 49070

(1840)

‎Recherches thermo-chimique" (Extrait du Bulletin scientifique publié par l'Academie imperiale des Sciences de Saint-Petersbourg, tome VII)‎

‎Paris, Fortin, Masson et Cie, 1840. Contemp. hcloth. Gilt lettering to spine. In ""Annales de Chimie et de Physique"", 2me Series - Tome 75. 447,(1) pp. a. 1 plate. (Entire volume offered). Hess's paper: pp. 80-103. The first and last leaves somewhat brownspotted.‎


‎First edition in French of Hess' first fundamental law in thermodynamic: ""the law of heat formation"" (1840), anticipating a specific example of the ""LAW OF THE CONSERVATION OF ENERGY"", 2 years before Julius Robert Mayer elucidated the more general principle in 1842 - claiming that ""the heat developed in chemical change is constant, whether the change occurs directly or indirectly in several stages""Germain Henri Hess is noted today for two fundamental principles of thermochemistry: the law of constant summation of heat (known simply as Hess's law) and the law of thermoneutrality. These discoveries were remarkable in that they were postulated without any supporting theoretical framework and took place in a field of study almost totally neglected by his contemporaries. Hess's law is of immense practical importance and is used to this day to determine heats of reaction when their direct measurements are difficult or impossible. (Chemistry Encyclopedia).""Numerous men, notably Lavoisier and Laplace had measured the heats evolved in various reactions, but thermochemistry received its first importent advance at the hands ofgermain Henri Hess, who showed that the heat evolved in a reaction is the same regardless of whether the reaction is carried out directly or in a number of steps. This generalization, known now as ""Hess's Law"", makes possible the calculation of heats for many reactions where direct measurement are impracticable.""(Leicester & Klickstein, A Source Book..., p329.""The thermochemical work of Hess was continued extensively in the second half of the nineteenth century through the studies of Thomsen and Berthelot. Both Berthelot’s principle of maximum work and the thermodynamic theories of affinity which came to prevail were clearly foreshadowed in the work of Hess. In addition to his internationally known research in thermochemistry, Hess was very influential in the development of chemistry in Russia. His text Osnovania chistoy khimii (Fundamentals of Pure Chemistry) went through seven editions and did much to establish the chemical nomenclature of the Russian language. He was always interested in technological questions, and many of his students later contributed to Russia’s industrial development."" (DSB).Parkinson ""Breakthroughs"", 1840 C. - Leicester & Klickstein, A Source Book, p 329. ‎

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‎HESS, (GERMAIN HENRY). - HESS' S THERMODYNAMICAL LAWS.‎

Reference : 44787

(1840)

‎Recherches thermo-chimique (Extrait du Bulletin scientifique publié par l'Academie imperiale des Sciences de Saint-petersbourg, tome VII) (+) Recherches thermochimiques" (Suite du Mémoire imprimé dans les Annales...tome LXXV). (+) Recherches thermoch...‎

‎Paris, Fortin, Masson et Cie, 1840 a. 1842. No wrappers. In ""Annales de Chimie et de Physique"", 2me Series - Tome 75 a. 3e Series - Tome 4.. With titlepage to Tome 75 and orig. printed wrappers to the issue (Septembre issue). Pp. 1-112 a. 1 engraved plate (entire issue offered). With titlepage to Tome 4. Pp. 129-256 (entire Fevrier issue) and pp. 257-384 (entire Mars issue). Hess' papers: pp. 80-103 (tome 75), pp. 211-229 (tome 4), pp. 290-316 (tome 4).‎


‎First appearance in France of Hess' two fundamental laws in thermodynamic 1: ""the law of heat formation"" (1840), anticipating a specific example of the ""LAW OF THE CONSERVATION OF ENERGY"", 2 years before Julius Robert Mayer elucidated the more general principle in 1842 - claiming that ""the heat developed in chemical change is constant, whether the change occurs directly or indirectly in several stages""and 2: ""the law of thermoneutrality"" (1842), stating, that when neutral salts exchange acids and bases in solution, the heat of the reaction is zero. - These papers were published at the same time in France and in Russia. Germain Henri Hess is noted today for two fundamental principles of thermochemistry: the law of constant summation of heat (known simply as Hess's law) and the law of thermoneutrality. These discoveries were remarkable in that they were postulated without any supporting theoretical framework and took place in a field of study almost totally neglected by his contemporaries. Hess's law is of immense practical importance and is used to this day to determine heats of reaction when their direct measurements are difficult or impossible. (Chemistry Encyclopedia).""Numerous men, notably Lavoisier and Laplace had measured the heats evolved in various reactions, but thermochemistry received its first importent advance at the hands ofgermain Henri Hess, who showed that the heat evolved in a reaction is the same regardless of whether the reaction is carried out directly or in a number of steps. This generalization, known now as ""Hess's Law"", makes possible the calculation of heats for many reactions where direct measurement are impracticable.""(Leicester & Klickstein, A Source Book..., p329.""The thermochemical work of Hess was continued extensively in the second half of the nineteenth century through the studies of Thomsen and Berthelot. Both Berthelot’s principle of maximum work and the thermodynamic theories of affinity which came to prevail were clearly foreshadowed in the work of Hess. In addition to his internationally known research in thermochemistry, Hess was very influential in the development of chemistry in Russia. His text Osnovania chistoy khimii (Fundamentals of Pure Chemistry) went through seven editions and did much to establish the chemical nomenclature of the Russian language. He was always interested in technological questions, and many of his students later contributed to Russia’s industrial development."" (DSB).Parkinson ""Breakthroughs"", 1840 C. - Leicester & Klickstein, A Source Book, p 329. ‎

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‎"HESS, (GERMAIN HENRY). - ""THE LAW OF HEAT FORMATION""‎

Reference : 48910

(1840)

‎Recherches sur les quantités de chaleur dégagées dans les combinaisons chimiques. (Lettre à M. Arago).‎

‎Paris, Fortin, Masson et Cie, 1840. 8vo. Contemp. hcalf. Spine gilt and with gilt lettering. Some scratches to spine. In: ""Annales de Chimie et de Physique"", 2e series, tome 74. 448 pp., 1 folded plate. Hess' paper: pp. 325-335. Stamps on verso of titlepage. Internally clean.‎


‎First edition of Hess's most famous paper, in which he outlined his law on thermochemistry. His principle, a progenitor for the first law of thermodynamics, came to be called Hess's law. It states that in a series of chemical reactions, the total energy gained or lost depends only on the initial and final states, regardless of the number or path of the steps. This is also known as the law of constant heat summation. Hess described here his newly discovered law, known as Hess's Law, in form of a letter to Arago. (The letter was also published in Comptes Rendus in a slightly modified form). ""Here thermochemistry received its first importent advance at the hands of Germain Hess, who showed that the heat evolved in a reaction is the same regardless of whether the reaction is carried out directly or in a number of steps..."" (Leicester & Klickstein ""A Source Book in Chemistry"", pp. 329-332). This paper preceded the larger papers also published in ""Annales de Chimie et de Physique"" and the original (and larger) paper in ""Bulletin scientifique, Academie impériale des Sciences (St. Petersbourg, 1840)"". The volume contains also papers by Laurent, Biot, Mulder, Melloni etc.Parkinson ""Breakthroughs"" 1840 C.‎

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