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110 BIBLIOGRAPHY. temperatures above zero. 5. The exudation of water contained in wood. Sagot, P. — Etudes sur la vegetation des Plantes potageres d' Europe a la Guyane Franchise. — Journ. Soc. Imp. et Centr. d'Horticult, 1860, torn. vi. 8vo. 22 pages. In Guiana, with a mean annual temperature of 27° C, and con- trasting dry and wet seasons, many of the culinary vegetables of the north cannot be grown at all, while others are uncertain or incom- plete in their growth, and none acquire their full and natural deve- lopment. M. Sagot remarks the short period which seeds appear to retain their vitality in Guiana, compared with the length of time they may be kept in Europe unimpaired. The seeds of the melon or hari- cot, which in France may be kept six or eight years, do not germi- nate after five or six months. The behaviour of each of the most common kitchen plants, also of several ornamental garden flowers under the climate of Guiana, is separately detailed. The cabbage, radish, mustard, cress, haricots (with care), water melons, the aubergine (Solatium melongena), chives (ciboules), are successfully and usefully cultivated ; while turnips, peas and beans, lentils, cicer, potatoes, tomatoes, asparagus, and the cereals, either altogether refuse to grow, or afford no useful produce. Compara- tive observations are appended upon the influence of equatorial cli- mate upon man, domestic animals, and plants, brought from cool la- titudes. In the opinion of the author, plants submit to climatal change much less readily than man, and man somewhat less so than most introduced animals. Note on Useful woods of French Guiana. — Bull. Soc. Bot. de France, torn, vii., pp. 16-7. The great proportion of hard and coloured woods belong to Le- guminosae, especially to the tribes Dalbergiese and Csesalpiniese. The valuable cabinet wood "Boco" is afforded by MahaUia guia- nensis, Bth. ; "Bagot," by Cynometra hostmanniana, Tul. ; Ga'iac (used for the " gorges" of pullies), by a species of Dipteryx. " L'an- gelique de Cayenne," celebrated for its utility in marine construc- tions, is Dicorem'a guianensis, Bth. Sanio, Karl. — Einige Beobachtungen liber den Bau des Holzes — Bota- nische Zeitung, 1860, pp. 193-8, 201-4, 209-17, with one plate. 1. On the structure of the pits of cell-walls and inter-cellular cavities, 2. The tertiary thickening layer of wood-cells. 3. On Lignine (Holzstoff). 4. On tannin in wood ; with observations on tannin generally. Schacht, H. — Der Baum. Studien ub. Bau u. Leben der hoheren Ge- wachse. 2nd edition. 575 engravings, 227 woodcuts. Berlin, 1860. Schlechtexdal, D. F. L. vox. — Ueber eine vielnamige Gartenpflanze. —Botanische Zeitung, 1860, pp. 289-90. This paper relates to Stachys germamca, and its immediate allies. Yon anderen Stachysarten. — Botanische Zeitung, pp. 293-5, 297-9, 301-3. (To be continued).