92 PHYSICAL EXPRESSION. 



followed in an animal when a portion of the brain 

 called the angular gyrus was destroyed. 



"In support of these conclusions, the following 

 details selected from the protocols of the several 

 experiments recorded elsewhere, will be sufficient. 

 In the first experiment the angular gyrus of the left 

 hemisphere was destroyed, the left eye was securely 

 bandaged, and the animal allowed to recover from 

 the state of chloroform narcosis. After recovery it 

 began to grope about a little in loco perfectly alert, 

 but would not move from its position. It did not 

 flinch when held close to the gaslight. Placed in 

 a cage beside its companions, it took no notice of 

 them, but sat still. Hearing and other senses re- 

 mained unaffected, and stimuli of these senses caused 

 active reaction" 



The quotation is given exactly ; the italics are 

 mine, and it is at once seen that the evidence of 

 blindness was the condition of movements, the kind 

 of reflex action following or not following upon 

 stimulation. This affords further evidence as to the 

 truth of the statement that we are dependent upon 

 the motor functions of the nerve-centres for almost 

 all the knowledge we have as to their functions. 



Reflex Action. The apparatus necessary for a 

 reflex action has been briefly described in chap, 

 iii. ; something more must now be said concerning 

 the time consumed in the production of a reflex 

 movement. Foster gives the following experiment 

 (op. cit, p. 471) : " If, in a brainless frog, the area 

 of skin supplied by one of the dorsal cutaneous 

 nerves be separated by section from the rest of the 



