ward?  in  the  median  plain  above  the  alimentary  canal,  have
assumed  an  encreased  development,  as  shown  by  Lyonet
and  Straus,  and  thus  more  intimately  united  all  the  seg-
ments and  parts  of  the  body  by  encreasing  these  bonds  of
connexion  between  all  the  organs  and  functions  of  vegetative
or  organic  life.  The  same  kind  of  change  in  the  whole
condition  of  the  nervous  system,  effected  by  the  metamor-
phosis of  the  insect,  is  seen  in  Straus'  figure  of  the  adult  or
imago  state  of  that  system  in  themelolontha  vulgaris  (Fig.  83.
