2 4 2 



PHYSIOLOGY. 



his tracks, though he will eat food if it is put in his mouth. 

 He seems to have lost the power of willing to do anything, 

 or what we call the power of volition. He originates no 

 action. 



A Pigeon with Cerebrum Removed. A pigeon with 

 its cerebrum removed acts in about the same way. It 

 remains quiet, stupid, paying no attention to ordinary 



f- Spinal Cord 



- 1st Spinal Nerve 



- 2d Spinal Nerve 



Fig. 81. Diagram of the Cranial Nerves and Sense Organs. 



events. A sudden loud noise may cause it to start. If its 

 tail be pulled, it moves forward to regain its balance. If 

 thrown in the air, it flies for a distance. It swallows food 

 placed in its mouth, but would starve surrounded by food. 



