Botany and Zoology. 73 
prove to be of any service to fern-students [which it surely will], 
_ they will owe it entirely to the generosity of Mr. Robinson.’ 
4, Researches in regard to the influence of light and vadiaie 
heat upon transpiration in plants, by J. Wimsnur ameerey . 
Ann. d. Se. Nat., Sept., 1877, from ‘Sitzun ngsb. der k. Akad. 
Wissensch., 1876, t. 74). Wiesner prefaces his memoir ae a ee 
historical account, of which we here give an abstract. Near the 
middle of the last century, Guettard demonstrated by rude ex- 
periments that light favors transpiration. Unger, and, later, 
Sachs have supposed that the movements of sto mata under the 
quent excitation. 
Wiesner, in the memoir now noticed, gives a detailed account 
periments, and presents the following conclusions. 
A part of the light, which has traversed chlorophyll is trans- 
e 
- feeble in the dark, although the stomata were 
widely open. Also that th rk heat-rays are less active in 
transpirat the luminous rays, and that the ultra-violet 
rays have no influence at all; that, whatever may nature 
of - rays, they act solely by elevating the ee of the 
tiss 
5. kes Botrydium granulatum ; by J. eeckeeninics and M. 
Worontn.—This is an interesting paper which appeared in the 
Botanische Zeitung of Oct. 12. The investigations were carried 
on simultaneously by Rostafinski in Strassb and Woronin in 
St. - fect the i peng which are beautifully done, being drawn 
by Wor As is well known Botrydium granulatum is a unicel- 
