360 



MESSRS. F. GOTCH AND V. HORSLEY 



The left cerebral hemisphere was now removed, and the effect of excitation of the 

 right corona observed in each half of the cord. 



The result is to show that the bilaterality continues, and apparently to the same 

 extent as before. 



The experiment is one which needs careful repetition, and special precautions to 

 prevent errors. 



VI. Excitation of Cortex and Corona Radiata. Effect in Sciatic Nerves. 



It has been already stated (Chapter V., Section 2, p. 332) that the excitation of the 

 cortex evokes electrical effects in the sciatic nerves ; and, further (Chapter VI., 

 Section 2, p. 339), that similar effects are evoked by excitation of the corona radiata. 

 A comparison between the amounts evoked in the nerves by excitation of one cortex, 

 or by observation of the changes in one nerve consequent upon alternate excitation of 

 each hemisphere, throws additional light upon the question of bilaterality of repre- 

 sentation of the limbs now under discussion. It will be in the remembrance of the 

 reader that the nerve effects derived from cortical excitation are remarkably small in 



