THE 8TRTTGTURE OF 11 



(pyloric end » the urinary tul Fig. 4, ur) 



arise. Th< in ten grouj out ti;' 



tubes, bo thai there are about one hundred and fifl 

 fine tubes in all. 



The intestine (ileum) lies in the fifth and sixth abdominal 

 segmei 



Behind the intestine is the colon, which is smaller than 

 the intestine proper, and makes a partial twist. The >■• 

 suddenly expands into the rectum, with six large n ! 

 (/hunts on the outside, held in place by sis muscular bands 

 attached anteriorly to the binder end <>f the colon. The 

 lvctum turns up toward its end, and the vent is situated 

 just below the supra-anal 

 plate. ^ 



Having described the <lL*vs- ><£> v - 



bive canal of the locust, with J^ 

 which that of the I" . I ' «? 



6) and the H\ (1 _. f] may U $* 



be compared, we ma\ state in "f ' 



a summary way tho functions L,V ' 



of the different divisions of ' v ; 

 the tract. The food after be- x 



ing cut up by the jaws is acted -^Nn w-r-t 



upon while in the crop by the 

 salivary Quid, which is alka- "~~ "" 



linfl •iml i>, ■-,.■ ana i ho i, ,-,,>. ' 



nut , ana possi cm prop- ventricu 



crtv ms in vcrtt'lii-itc- nt Europt 

 t in. .i- in \t in iii.m .-. . » I hon 



rapidly transforming the 



starchy elements of the food into soluble ami assimik 



glucose. The digestive action carried on in tl 



i then, in a vegetable-feeding in 

 results in tin' conversion of the starchy no 



sugar. This process n very slowly. When dig 



tion in the crop has ended, the t 1 subi ner- 



getic pressure by the walls of tlie crop, which n ake | 

 stal tic contractions, filters graduallv through : 

 proventriculus, directed by the furrows chitinous 



