THE BRAIN. 431 



eye of the same side. After unilateral destruction of the angular con- 

 volution, vision returned to some extent in the blinded eye after 

 twenty-four hours ; but if the convolution were destroyed on both 

 sides, blindness was complete, and there was no return of sight in 

 either eye. The operation produced no other effect than loss of vision; 

 general sensibility and the power of motion being unimpaired. 



FIG. 115. 



BKAIN OF DOG; showing excision of angular convolution and two adjacent anterior convolutions 

 on left side. Blindness of right eye. 



We have obtained similar results in the dog by excision of the 

 angular convolution on the right and left sides in two different animals. 



FIG. 116. 



BRAIN OF DOG; showing excision of angular convolution and adjacent posterior convolution on 

 right side. Blindness of left eye. 



In each case vision remained perfect in the eye of the same side with 

 the injury, but was abolished in the eye of the opposite side. There 

 was no other perceptible affection of either sensibility or movement ; 

 and the blindness of the affected eye was persistent during the life of 

 the animal, continuing in one instance for over ten days. It appears 

 accordingly highly probable that the power of visual perception is 

 seated in that part of the cortex occupied by the angular convolution. 



