150 



PROFESSOR W. H. THOMPSON. 



a, 1), c, d, represent the areas removed in certain of the experi- 

 ments. 



In most of the experiments the motor area was not exposed 

 and was never actually injured in any way. 



The wounds in every instance healed by first intention, and 

 the animals were allowed to live for periods varying from nine 

 to twenty-one days. They were then painlessly killed hy an 



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

 viz., marmosets 5, 6, 7, 8. 



overdose of chloroform, and the brains and spinal cords hardened 

 in Miiller's fluid. Subsequently thin slices were stained in 

 Marchi's solution, and cut in celloidin. 



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

 portion of cortex, a subcortical lesion was made, and the piece 

 left in situ. The results of these differed in no way from those 

 furnished 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 



