384 



ZOOLOGY. 



of villosities with which the chyle-forming stomach is usu- 

 ally furnished, seem to serve for the secretion of a gastric juice, 



and it is also in this cavity 

 that the bile is poured.. 

 There exists no liver, pro- 

 perly speaking, in insects ; 

 but this organ is replaced 

 by long and delicate tubes, 

 which float in the interior 

 of the abdomen, and open 

 superiorly into the chyle- 

 forming stomach (c, Fig. 

 365). These biliary ves- 

 sels also take the place of 

 urinary glands, for it is here 

 that the uric acid is formed. 

 By one of their extremities 

 they always open into the 

 chyle - forming stomach, 

 and the other extremity 

 is sometimes free, some- 

 times fixed to the intes- 

 tine, whether near the first 

 opening or in the neigh- 

 bourhood of the rectum. 

 Finally, we still find, to- 

 wards the posterior extre- 

 mity of the intestinal canal, 

 other secreting organs (e) 

 serving to elaborate parti- 

 cular fluids (such as the 

 venom of the bee) which 

 several insects eject from 

 the extremity of the abdo- 

 men when they are dis- 

 turbed. 



526. It would ap- 

 pear that it is by simple 

 imbibition that the chy It- 

 traverses the walls of the 



Fig. 365. Digestive Apparatus.* 



* a, head carrying the antennae, mandibles, &c. ; b, crop and gizzard, fol- 

 lowed by the chyle-forming stomach; c, biliary vessels; d, intestine; *, 

 secreting organs ; /, anus. 



