272 



HITCHCOCK'S ANATOMY 



Large air-sacs are also contained in the abdomen, freely com- 

 municating with the lungs, and acting as reservoirs for them. 

 A minute examination of the structure of these organs shows 



Fig. 266. 



Lunglet of a Fowl. A. Section passing in the direction of the Bronchus. B. Sec- 

 tion cutting it across. 



Fig. 267. 



Lungs of Frog. a. Hyoid Apparatus, 

 fc. Cartilaginous Ring. c. Lungs Proper. 



that they are made up of lo- 

 bules or lunglets, each of 

 which has its own system of 

 vessels, and but little com- 

 munication with the other 

 lunglets. 



485. Lungs of Reptiles, 

 — The Hiss of Serpents. — 

 Mechanism of Respira- 

 tion. — The Lungs of the 

 several orders of Reptiles are 

 for the most part capacious 

 sacs, the extent of surface in 

 which is but little increased 

 by smaller sacs or vessels 

 within them. In the Frog, 



What appendages do they have which do not exist in quadrupeds ? 485. What are the 

 lungs of reptiles ? 



