34 



large cavity remained. He went to school to the same 

 mistress as befoi-e, and she informed me that except a 

 certain irritability of temper, he was as intelligent as ever 

 and could learn his lessons with the usual aptitude. I 

 need not enter into particulars, but merely say that some 

 considerable cortical substance had been extirpated with- 

 out serious results to mentality. Any number of such 

 cases might be culled from medical literature to show 

 that all brain substance is not necessary to physical nor 

 mental life, and that the localization of psychical power 

 is not borne out by experiment or pathology. It is 

 dangerous to adopt a pet theory as a foregone conclu- 

 sion, and endeavor to drag in every argument that we 

 find at hand to support it, without stopping to find 

 out if all the phencjmena can be explained by our 

 hypotheses. 



If the views advanced by me are not accepted, I can 

 not conceive any other solution except the old Hippo- 

 cratic doctrine, a modified idea of which exists in " hump- 

 ologij^'' viz: a duality of the ego, and that by mutual 

 agreement this Siamese twin only becomes half diseased 

 alternately. So by a law of compensation one can do 

 the work of both if the necessity arises. If this sug- 

 cjestion of double function be not satisftictory, then 

 vicarious work amonsi; the onj^ans or sesijments of oro-ans 

 might approach a solution of the difficulty, although it 

 would be a hypothesis fatal to the localizers' theory. 

 The opinions givt ii in this monograph meet many of 

 the difficulties, and at the same time do not fly in the 

 face of acce})ted facts exhibited in health and disease. All 

 of the phenomena of mind, and of the functions of the 

 physical system go to show, when brain tissue is injured 

 by disease or by traiimntic effects, that the artificial 

 divisions of it by some physiologists are not consistent 

 with experiment. It is worthy of note that no nerve 



