184 



Proceedings of the Royal Irish Academy. 



In some of the experiments, instead of actual removal of a portion 

 of cortex, a subcortical lesion Avas made, and the piece left in situ. 

 The results yielded diifered in no way from those fiu-nished by the 

 more usual method of removal. Control experiments, in which the 

 surface was merely exposed, were also performed. In all, the results 

 of experiments upon thirty brains were investigated, fifteen of which 

 were monkeys and a like number marmoset brains. Through these, 



Fig. 1. — Showing tracings of lesions from four of the marmoset brains, 

 viz. : marmosets v. , vi. , vii. , viii. 



sections were made in various directions, horizontal, coronal, and 

 oblique. Before cutting, photographs or tracings of the lesions, or both, 



were made. 



Restjxts Obtained. 



Degenerated fibres were ascertained to exist in the following tracts 

 and fibres: — 



1 . Association Fihres. — In the fii'st instance short association fibres 

 connecting the removed area with adjacent convolutions or portions of 



