GONIN 'S OBSERVATIONS 



651 



Diptera, but mistakes o'f this nature have frequently happened in the 

 history of science. 



The latest and most detailed researches are those of J. Gonin on 

 the metamorphoses of Pieris brassicce, made under the direction of 



FIG. 605. Full-grown larva of Pieris bras&ieas opened along the dorsal line : d , digestive 

 canal; , silk -gland ; (/, brain, st 7, prothoracic stigma; at IV, 1st abdominal stigma; a, a', germs 

 (buds) of fore and hind wings; p, bud of thoracic segment; those of the 3d pair are concealed 

 under the silk-glands ; /-///, thoracic rings. After Gonin. 



Professor E. Bugnion. They fill an important gap in our knowl- 

 edge, and show that the Lepidoptera transform in nearly the same 

 manner as described by Weismann in Corethra. We give the follow- 

 ing condensed account of Gonin's observations. 



On opening a caterpillar entering on the semipupa state (Fig. 605), 



