312 



COMPARATIVE PHYSIOLOGY. 



ryngeal, and many other nerves be stimulated ; also if food be 

 introduced into the stomach through a fistula. 5. If the pe- 



f: 





PiQ. 255.— Maxillary and Bnblingnal gland (Chaavean). H, maxillarj gland; S, Whar- 

 ton's duct; T, Bublingnal gland. 



ripheral end of the chorda tympani be stimulated, two results 

 follow : (a) There is an abundant flow of saliva, and (6) the 

 arterioles of the gland become dilated : the blood may pass 

 through with such rapidity that the venous blood may be 

 * bright red in color and there may be a venous pulse. 7. Stimu- 

 lation of the medulla oblongata gives rise to a flow of saliva, 

 which is not possible when the nerves of the gland, especially 

 the chorda tympani, are divided ; nor can a flow be then excited 

 by any sort of nervous stimulation, excepting that of the ter- 

 minal branches of the nerves of the gland itself. 8. If the sym- 

 pathetic nerves of the gland be divided, there is no immediate 

 flow of saliva, though there may be some dilatation of its ves- 



