2. Brussels, Royal Academy (Academie royale de Belgique), 1864, in-4°, 34 pp + 5 plates, published as a treatise in the yearbook of the Academy (VolumeXXXIV), loose, no wrappers (in need of a binding, removed from the yearbook). Two plates slightly foxed. (Biology, microorganisms, vorticella, epistylis).(see bibliography = Tables Générales des Mémoires, item 372.).
Reference : 20638
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