The Cionus 
Cionus’ larva is covered, is a viscous fluid, 
soluble in water, quickly emitted and ex- 
tremely slow to dry, even in an intensely hot 
sun and in the parching breath of the North- 
wind. 
Having obtained these data, let us see how 
the ampulla is constructed in which the trans- 
formation will take place. On the 8th of 
July 1906, my son Paul, my zealous collabo- 
rator now that my once sturdy legs are fail- 
ing me, brings me, on returning from his 
morning walk, a magnificent branching head 
of mullein peopled by the Cionus. It con- 
tains an abundance of larva. Two of them 
in particular delight me: while the others 
stand browsing, these two wander about rest- 
lessly, indifferent to their food. Beyond any 
doubt, they are looking for a spot favourable 
to the process of the nymphosis. 
I place each of them singly in a small 
glass tube which will allow me to observe 
them easily. In case they might find the 
food-plant useful, I supply them with a sprig 
of mullein. And now, lens in hand, from 
morning to evening and then by night, as far 
as drowsiness and the doubtful light of a can- 
319 
