580 



THE NERVOUS SYSTEM 



the dog's brain. It was found that the part might be sliced away or washed 

 away with a stream of water, but that no permanent paralysis ensued. 



More extensive observations, however, have confirmed Ferrier's original 

 statement, at any rate with regard to the monkey's brain. Destruction of the 



FIG. 410. 



FIGS. 409 and 410. Diagrams of Monkey's Brain to Show the Effects of Electric Stimulation 

 of Certain Spots. (According to Ferrier.) 



motor areas for the arm produces some permanent paralysis of the arm of 

 the opposite side, and similarly of that for the leg, paralysis of the opppsite 

 leg. If both areas are destroyed, permanent hemiplegia ensues. Paralysis 

 of so extensive and permanent a character does not, however, appear the 

 rule when the brain of a dog is used instead of that of the monkey. It is 

 suggested that in the animal lower in the scale the functions which in the 



