ON THE MAMMALIAN NERVOUS SYSTEM. 



473 



The experiments upon this point were made upon two Cats, in one of which (259)* 

 the lateral column had been divided 34 days previous to the experiment, whilst in 

 the other an intervening section was made of all structures except one lateral 

 column at the time of the experiment. 



The results of the experiment in the first case are given in the adjoining table: 



LEFT Lateral Column divided 34 days before Experiment, at 10th Dorsal Vertebra. 



It will be noticed that no change at all in the left nerve followed excitation of the 

 left lateral column, although, in the right nerve, a change was evoked from the 

 right lateral column. Since, however, nerve effects are not easily evoked from the 

 lateral column by moderate stimuli, and when these are employed strong violent 

 reflex effects are produced by stimulating other columns, it was desirable to adopt a 

 different procedure and make an intervening section of such character as would 

 divide all fibres except those in one lateral column, which could then be used as a 

 standard of comparison. 



The results before and after such division are shown in the following table : 



* For full description of this animal as regards its appearances during life and after death, see p. 405. 



MDCCCXCI. B. 



