Geology and Natural History. 313 
seen th “pe : ino 
een that this has a direct bearing upon some of Pringsheim 
8 
views, 
um and Spirogyra, Yellowish-brown, Navieula and Pinnularia, 
d 
of assimi ~ 
f assimilation under different rays were made out. The maxi- 
in plants, has come to the conclusion that 
. light on the stracture and arrangement of chlorophyll-paren- 
hymna was pointed out. It ma : 
uthor had previously stac 
chyma is that best adapted for transpiration and charac 
i or climatic rela- 
le 
e growing in light and those found in shade. 4 ¢ 
Dees are of the character above described, namely, adaptation to 
