CHAPTER III. 



Internal Structure. Digestive Organs. Gullet, Crop, Stomach 

 Adaptation of, to different Habits of Birds. Gastric Juice, 

 its Use and Properties. Gizzard, its Grinding Powers. 

 Respiration of Birds. 



HAYING briefly pointed out the most prominent features 

 of the skeleton, as influencing the general form of birds, 

 we shall now proceed to give a short sketch of the structure 

 and uses of some of the internal parts, commencing with 

 those for the supply and consumption of food. The follow- 

 ing figure may assist our explanation. 



The gullet (oesophagus), A, opens into the crop (ingluvies) 

 B, which forms a sort of bag; on quitting this it extends to 

 what is called the second stomach, c, (infundibulum, or ven- 

 triculus succinturiatus,) usually funnel-shaped, from whence 



