2 THE TONER LECTURES. 



vice versa, the right side of the brain being ^ne only organ 

 serving for volition and sensation for the left side of the body. 

 This view I will have first to disprove. 



Beginning, however, with what relates to the noblest functions 

 of the brain — that is, its capability to serve in mental phenomena 

 — I shall say at once that I am not the first to put forward the 

 view that we have two brains. Long ago Sir Henry Holland, 

 and Dr. Wigan,' and a few others, insisted on the fact that each 

 side of tlie brain is perfectly sufficient for the full performance 

 of the mental functions. But they stopped there, and they have, 

 therefore, left to others to go further. In regard to this I may 

 say, if we adopt the view, that we have two brains, a conclusion 

 will follow, which — although I shall have to speak of it more 

 at length by and by — I must now allude to. It is quite certain 

 that if we make use of only one brain for most of our actions, 

 we leave inactive one-half of the total mass of brain matter, 

 and, therefore, we leave quite useless one- half of the most im- 

 portant of Qur organs as regards manifestations of intelligence, 

 will, and perception or sensation. If this conclusion is correct, 

 j^ou will easily understand how important it is to come to the 

 point which I have in view in this lecture ; that is, that we 

 ought to give education to the two sides of the brain, or, 

 rather, to the two brains. 



As regards intelligence, it is hardly necessary to insist, after 

 what has been said by the physiologists, Sir Henry Holland 

 and Dr. Wigan. They both show that there are a great many 

 facts which would seem to prove that either half of the brain 

 may equally perform intellectual functions. It may be, however, 

 that their proofs were not sufficient. 



Dr. Wigan has insisted upon a feature of great interest, 

 which is that in cases of insanity sometimes, and I may say 



' The Duality of the Mind Proved by the Structure, Functions, and 

 Diseases of the Brain, by A. L. Wigan, 8vo., London, 1844. 



