60 INTERNAL ORGANS. 



When the food has been taken into the mouth and 

 bruised, or chewed by the jaws when those are 

 moveable, or sucked up when they form a sucking 

 tube, it passes on to the haus or entrance (') of the 

 gullet, and thence to the stomach and intestines as in 

 the larger animals. 



In man, the food is mixed, during the process of 

 chewing, with a peculiar fluid supplied from several 

 glands or fountains situated near the mouth. In 

 insects, similar fountains ( 2 ) have been described by 

 Ramdohr, Leon Dufour, and others. They are most 

 obvious in sucking insects, and when a fly cannot suck 

 a bit of dry sugar, it has been observed to moisten it 

 with this fluid. 



The organs ( 3 ) which furnish the silk, spun by the 

 silk- worm and other caterpillars, are similarly situated 

 with the preceding, and perhaps are the same organs. 



The most complicated organs of digestion, (found, 

 of course, in insects feeding on vegetable matter,) 

 may be described under six divisions, the gullet, the 

 crop, the gizzard, the stomach, the intestines, and 

 the vent. 



(1) In Latin, Fauces or Pharynx; in Scotch Haus. 

 (2) In Latin, Sialisteria. (3) In Latin, Sericteria. 



