40 



TRANSFORMATIONS OF INSECTS. 



fly, beetle, or moth. Consequently, the most active condition 

 obtains the greatest development of the lateral nerves. 



The sympathetic nerves, as they are called, are independent 

 of the chain of nervous cords and ganglions, and their twigs supply 

 the muscles of respiration to a certain extent, and those of the 

 stomach. 



THE SYMPATHETIC NERVE OF THE SILKWORM MOTH. (Magnified.)- 



It passes down and above the ganglionic chain. 



No sooner has the caterpillar 

 chrysalis, than the ganglionic chain 

 the cords which united the nervous 

 their course ; then they shorten ; 

 drawn together. Day by day the 

 are gathered towards the thoracic 

 closer together. The middle part 



become transformed into the 

 suffers considerable changes ; 

 centres have become wavy in 

 and thus the ganglions are 

 first ganglia of the abdomen 

 centres, which have become 

 of the chain is altered the 



