64 INTERNAL ORGANS. 



bably mere branches of two fundamental ones), found 

 in bees, wasps, and dragon-flies. 



It is in the stomach that the food is converted, by 

 means of the digestive fluid, from the gastric vessels 

 and the bile, into a pulpy mass, called chyle, if we 

 may follow the analogy of other animals. 



The outlet ( l ) of the stomach is in insects furnished 

 with a valve to prevent the too rapid passage of the 

 chyle into the intestines. 



The intestines ( 2 ) form an extended portion of the 

 organs of digestion, which may be divided into four 

 parts, the chyle gut, the small gut, the blind gut, 

 and the vent gut. 



The chyle gut( 3 ), which is always found in large 

 animals, is seldom, in insects, different from the small 

 gut. When it is distinguishable, as in the glow- 

 worm, it is very smooth. It receives the chyle from 

 the stomach. 



The small gut ( 4 ) is usually strait, smooth, and of 

 equal size through its whole length, though there are 

 bulgings in some species ; and, for the most part, it 

 has many convolutions. The chyle, in passing along, 

 has its nutritive portions taken up by the inner mem- 

 brane of this intestine, through which it passes into 

 the cavity of the abdomen, and not, as in other 

 animals, into lacteals, in order to be converted into 

 red blood, which is not found in insects. 



The blind gut ( 5 ) consists usually of an egg-shaped 

 cavity, formed by the bulging out of the lower end 

 of the small intestine. It is often covered with plaits 

 orbands ; sometimes the bile vessels open into it, 

 and it always contains the crude parts of the chyle 

 rejected by the small gut as unfit for nourishment. 



(1) In Latin, Pylorus. (2) In Latin, Intestina. 



(3) In Latin, Duodenum. (4) In Latin, Inestinum tenue. 



(5) In Latin Caecum. 



