CHAPTER III. 



Internal Structure. Digestive Organs. Gullet, Crop, Stomach 

 Adaptation of, to different Habits of Birds. G-astric Juice, 

 its Use and Properties. Gizzard, its Grinding Powers. 

 Respiration of Birds. 



TTAVING 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, (irifundibulum, or ven- 

 triculus succinturiatus,) usually funnel-shaped, from whence 



