NER VO US S YS TEM. 
65 
furnish nerves to the muscles in connexion with the 
wings, and the last one [d) branches and supplies those 
of the armature, genital organs, and sting. 
Viallanes (165) and Ranvier (137) have shown 
that muscles are supplied by nerves which pass into 
the sai' colemma ^ or outer membrane, and just before 
doing so they form a ganglionic plexus."^ 
The vegetative, or organic life — that which is be- 
yond the will, and relates to the digestive functions, 
for instance — is maintained through the agency of 
offshoots from the main nervous structures. This 
is sometimes called the stomato-gastric nerve system, 
and it is provided with small ganglia, which send their 
nerve fibres to the organs of digestion, respiration, 
circulation, and reproduction. 
Besides these, Blanchard ( 7 ) has described the 
sympathetic nerves, which commence at the oeso- 
phageal collar and reunite immediately, having in each 
segment of the body small triangular ganglia, which 
send out numerous threads radiating to every part of 
the body. 
* When many are near together, the branches crossing and 
intercrossing together. 
F 
