Full- (I grown 

 larva. 



Eighteen 

 hours. 



One hour Twelve 



after hours, 



changing. 

 Immediately 



pupation. FiQ. 38. Changes in the nervous 

 Half an hour system of a butterfly, illustrating 



changing. mechanical " cephalization." (From Packard, 



after Newport.) 



Twenty- 



hours 



Forty-eight 

 hours. 



Fifty-right 

 hours. 



