38 TRANSFORMATIONS OF INSECTS. 
these formerly separate ganglions are united, and form a bulky 
mass in the middle of the thorax. Nevertheless, the points of 
THE NERVOUS SYSTEM OF THE SILK- THE NERVOUS SYSTEM OF THE SILK- 
WORM MOTH (Magnified). WORM CATERPILLAR (Magnified). 
union may be detected by unusual care. The connecting cords 
are, however, lost. 
