PIIANEROGAMIA. 
617 
"Weiss, A. und J. Wiesner. —Beitrage z. Kenntniss der chemischen 
und Physikalischen Natur des Milchsaftes der Pflanzen. Bot. 
Z. 1862, p. 125, pt. ii. Euphorbia platyphylla , var. A micro¬ 
scopical, chemical, and physical examination of the milky juice. 
Wendlakd, H. —Ghamaedorea Warsceiviczii, eineneue Palme. Bonpl. 
1862, p. 37. 
-Beitrage znr Palmenflora der Sudseeinseln. Ibid p. 190. 
Three new genera of Palms are described from the Samoa Islands 
and Eijis— Clinostigma , Pritchardia and Coelococcus. 
Wicke, W.—Ueber das Vorkommen und die Physiologische Yer- 
wendung der Kieselerde im Pflanzenreiche. Bot. Zeit. 1862, 
p. 76. An analysis is given of the siliceous bark of the celebrated 
Canto Tree ( Hirtella silioea , Gris.) 
-- Weitere Beobachtungen fiber das Yorkommen und die 
physiologische Yerwendung der Kieselerde im Pflanzenreiche. 
Gott. Nachricht. 1862, p. 53. With observations upon the silica 
contained in the bark-layers of native trees, also in fibres used 
for textile purposes. 
•-Beobachtungen an Chenopodium vulvaria fiber die Ausschei- 
dung von Trimethylamin. Ibid. p. 393. Plora 1862, p. 445. 
Wiesner, J.—Einige Beobachtungen fiber Gerb- und Earbstoffe der 
Blumenblatter. Bot. Zeit. 1862, p. 389. The action of alkaline 
reagents, &c. upon these substances. 
Wigand, A.—Einige Satze fiber die physiologische Bedeutung des 
Gerbstofies und der Pflanzenfarbe. Bot. Zeit. 1862, p. 121. 
Upon the distribution of Tannin in plants, its relation to the. 
vital phenomena of the tissues in which it occurs, and its occur¬ 
rence transitorily in relation to starch and other hydro-carbons; 
also upon its relation to the colouring matter of the cell-wall in tro¬ 
pical red dye-woods. With respect to the red autumnal coloration 
of leaves, the author states the colouring matter to stand in no 
direct relation to Chlorophyll, since they may occur in the same 
or distinct cells, or the former in the cells of the epiderm in which 
Chlorophyll does not occur. In either case the red colour is 
dissolved in the watery cell-sap and is not granular. The relation 
of the red element to tannin is insisted upon : the red coloration of 
spring and autumn only occurring in plants containing it. Eurther 
observations are added on the colouring matter of petals and 
the red and blue of many baccate fruits, and the relation of these 
to tannin. 
.— -Ueber das Yerhalten der Zellenmembran zu den Pigmenten. 
Ibid. p. 129. 
-Ueben der Sitz der China-Alkaloide, Ibid. p. 137. 
Wilekomm, M. et J. Lange. — Prodromus Elorae Hispanicae. 
Yol. i. pars altera, pp. 193-316. (Colchicaceae to Aristolochieae ). 
A Conspectus of the Eamilies and Orders (the Orders of M. Will- 
komm corresponding to Alliances, the Eamilies to Nat. Orders as 
generally accepted) of the Spanish Elora is prefixed to the part. 
