[23] Philosophical Transactions, R. Soc. Lond., vol. clii. p. 1039.
[24] Heer, Flore Fossile des Regions Polaires, Zurich; also Bibliotheque Univ. xxxix. p. 12; see also Ann. Nat. Hist. 4th ser. i. 61, iv. 81.
[25] Raulin, Sur les Transformations de la Flore de l'Europe centrale pendant la période Tertiaire.—Ann. des Sc. Nat. 3d ser. Bot. x. 193.
PROFESSOR BALFOUR'S
BOTANY.
In one vol., royal 8vo, pp. 1117, with 1800 Illustrations, price 21s.,
CLASS-BOOK OF BOTANY.
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