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 become transformed into the 
chrysalis, than the ganglionic chain suffers considerable changes ; 
the cords which united the nervous centres have become wavy in 
their course ; then they shorten ; and thus the ganglions are 
drawn together. Day by day the first ganglia of the abdomen 
are gathered towards the thoracic centres, which have become 
closer together. The middle part of the chain is altered the 
