438 



MESSRS. F. GOTCH AND V. HORSLEY 



EFFECT of Section of Posterior Column at the 10th to the 12th Dorsal Vertebra on 



the Opposite Side to the Nerve Excited. 



From these results it is seen that the cord effect is reduced by the section, and 

 that this reduction in the observed cases was more marked in the Cat than in the 

 Monkey. If we take the two sets of experiments together, a.s in the previous 

 results of the division of the posterior column of the same side, then the reduction is 

 found to be from 100 to 87, that is, 13 per cent. 



This evidence therefore points to a crossing of effects from one side of the cord to 

 the other as probable, such crossing and the ultimate conveyance of the impulses 

 being more or less bound up with the posterior column on the opposite side to the 

 stimulated nerve, to the extent of 13 per cent, in the animals we have as yet 

 examined. 



