INFLUE>sCE ON THE HUMAN SYSTEI\r. 109 



He lent new perfumes to tlie breatli of the soutli, 



On liis back hung his wallet and flail. 

 Behind him came Health from her cottage of thatch^ 

 Where never j^hysician had lifted the latch."'^ 



This direct action of the fumes of tobacco on 

 the olfactory nerve, and thereby on the cerebrum, 

 is, I submit, the whole rationale of the various 

 effects experienced by different smokers. These 

 must necessarily differ according to the conforma- 

 tion of brain in each individual. Where the 

 imaginative faculties predominate, their activity 

 will be exalted ; where the reasoning powers are 

 predominant, they will attain greater concentra- 

 tion ; and so of all the functional activity of the 

 brain — including, of course, those manifestations 

 which we designate as moral or social — since the 

 entire mass of the brain must become involved in 

 the nervous action, as I have endeavoured ta 

 show in my hypothesis. Hence I am decidedly 

 of opinion that no one should smoke before man- 

 hood — that is, before the brain has acquired its 

 full natural expansion and activity ; in other 

 words, before the age of twenty or twenty-five 



* Smart. 



