1913 99 p., 11 figures, 2 coloured lithographed plates, royal 4to (25 x 32,7 cm), modern cloth with author/title in gilt on spine. Arxivs de l’Institut de Ciencies. Library/discard stamps. Title-page and first two pages in xerox-copy. Rare.
1915 99 p., 10 figs, 3 coloured plates, royal 4to (24,5 x 33 cm), paperbound. Arxivs de l’Institut de Ciencies. Library/discard stamps, upper end spine worn, else a good copy of this rare publication.