298 



[CHAP. 



DIAGRAM OF THE ARTERIAL SYSTEM OF THE ADULT FOWL. 



P.A. root of pulmonary artery. L.in. left innominate artery. 

 D.A. dorsal aorta. COB. cseliac arteries, mes. mesenteric 

 artery, ar.r. renal arteries, fern, femoral arteries. Is. 

 ischiatic arteries, hyp. hypogastric arteries, cau. caudal 

 artery. The other letters as in Fig. 93. 



and after the chick has begun to breathe by the 

 lungs. 



On the third day the circulation is of an exceed- 

 ingly simple character. 



