be 
coms 
Pees 
fe Tae 
1888.) BOTANICAL GAZETTE. 
149 
up at the tips than to prevent it by turning them down? If 
it bends the styles in different directions fertilization will be 
more likely to occur in those flowers whose styles turn up. 
In this way the selective influence of insects will determine 
that only those flowers will be preserved whose styles are 
affected in a certain way by gravitation, so that the influence 
of gravitation will be subservient to the selective influence of 
insects. If, however, the action of the clinostat destroys the 
curvature of the styles, this character is said by Vochting to 
be due to gravitation. If it fails to destroy other characters. 
these are referred to an internal cause. 
considered to be the cause of the adaptations. 
na paper entitled ‘*‘ From Buttercups to Monk’s-hood,”””” 
Grant Allen follows a regular flower, like Ranunculus, 
rough its transformations into an irregular form, like Aco- 
oe of the stem, as in the common buttercups. Now, Mr. | 
erbert Spencer has pointed out that solitary terminal 
d, whenever they 
planation of their 
: Are 
SMe cae Gee eae E 
oR tay ee loner tat “Seino 
