1892.] Noteworthy Anatomical and Phystological Researches. 123 
veloped that the stem has attained a sufficient thickness to 
give shelter to the protecting ants and to produce the exud- 
ation. The author has also observed a similar fact concern- 
ing the protection of ants in Acacia cornigera. 
Another interesting fact, to which the author calls atten- 
tion, is the difference in germination of closely related 
species. It is especially striking in the genus Amemone, and 
as Hepatica triloba, while Pulsatilla vulgaris and P. pratensts 
the other ones by having the plumule above 
round with the first developed leaves of normal shape. The 
author describes also the germination of some species of 
Dentaria, which show similar differences. 
That the Shape of the leaves may depend on certain ex- 
ternal Causes is shown by Oxalis rubella and Asarum. In 
Oxalis the first leaf after the cotydedons is quinate, while the fol- 
lowing is fleshy and scale-like; but when the first leaf is cut off the 
Succeedi 
like. As 
