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- 

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