) 
4 
Jt 
1886. | BOTANICAL GAZETTE. 
vantage might be looked for in the slow movement of the pol- 
linia of Asclepias. Indeed, Mr. Corry, who has observed this 
phenomenon in A. Cornuti, states that it is of advantage, although 
he fails to show it; and I think it impossible so to do on the 
supposition that the pollinia are introduced by the corpuscula. 
He says: ‘Some considerable time, moreover, must elapse after 
the pollinia are extracted before the corpuscular appendages are 
so far dried that both pollinia of the same corpusculum can be in- 
troduced through the fissure into the alar chamber, and in the 
meantime the insect has had time to reach another flower or plant*.” 
On another page he observes: “ If the movement did not oceur 
movement is hardly an advantage under this view. If the cor- 
foot of an insect commonly enters the stigmatic chamber it is not 
hard to understand how the corpusculum should go in with it. 
But when the corpusculum is fastened to a hair which is directed 
_ outward and downward from the leg of the insect, and which is 
often so short that the corpusculum is fairly in contact with the 
n the examination of the feet of 
hive bees killed on the flowers, I have failed to find a single case 
fore, the structure of the cor usculum is so far from facilitating 
the introduction of the pollinia that it prevents the part to whic 
it is attached from being again caught in the slits; 
8 Ibid. p. 195. 
Ibid, p. 190. 
