Geology and Natural History. 487 
9. Anatomie Comparée des Feuilles chez quelques Familles de 
: Dicotylédones ; par M. Casturr DeConvorte, A memoir sep- 
arately issued from the Mem. Soc. Phys. and Hist. Nat. de Geneve, 
tome xxvii, partie 2, 1879. pp. 427-480, and two plates, 4to.— 
One of Cassimir DeCandolle’s earliest studies was into the struc- 
ture and relations of the fibro-vascular elements of the leaf, and 
: the results and deductions were brought out in his brief article 
entitled Theorie de la Feuille, in the year 1858. The present 
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