ON THE MAMMALIAN NERVOUS SYSTEM. 



393 



under these circumstances were then noted. The following is a table showing 

 the results obtained : 



ELECTRICAL Effects in Lumbar Cord Evoked by Excitation of Dorsal Cord after 

 Intervening Hemisection on the Right Side at 12th Dorsal Vertebra. 



INTERVENING Hemisection on Left Side at 12th Dorsal. 



The average results of the excitation of the lateral and posterior columns, 

 when grouped, as dependent upon the intensity of the stimulus, show the following 

 quantitative comparison. 



AVERAGE Effects obtained by Exciting Columns on Side of Section. 



Lateral . 

 Posterior 



Minimal 

 stimulation. 



8 

 2 



Maximal 

 stimulation. 



23 

 29 



MDCCCXCI. B. 



3 E 



