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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. 
TTAYIN G 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 
