ON THE MAMMALIAN NERVOUS SYSTEM. 



381 



(b.) Average of Experiments. 



The two experiments just described are types of all those made upon normal 

 animals. The following table gives the results of the readings obtained in four Cats 

 and one Monkey, with stimuli which were varied in one particular only, that of 

 intensity. 



It will be noticed that the average in the Cat of the deflections produced by 

 excitation of the posterior columns is twice as great as that following stimulation of 

 the laterals. 



In the Monkey, on the other hand, the average of the stimulation effects obtained 

 from the lateral is about half as large again as that produced by the excitation of the 

 posterior columns. 



EXCITATION of Cut Dorsal Cord (Peripheral Surface). Electrical Effect in 



Lumbar Cord. 



