. Who is insane? . tercourse withhis pupils he constantly meets with such in-stances of tendencies to vicious development ofthe brain, which could be changed either by re-moving all sources of stimulation of the nerve-centres involved, or by counteracting their nu-trition through the diversion of blood to otherparts of the brain. Infinite are the possibilitiesof developing one section of the brain at the ex-pense of another. Bandage a childs eyes andhe will depend upon the ear for knowledge ofevents occurring around him, and, meantime,the nerve-cells of sight will waste, while thoseof hearing
. Who is insane? . tercourse withhis pupils he constantly meets with such in-stances of tendencies to vicious development ofthe brain, which could be changed either by re-moving all sources of stimulation of the nerve-centres involved, or by counteracting their nu-trition through the diversion of blood to otherparts of the brain. Infinite are the possibilitiesof developing one section of the brain at the ex-pense of another. Bandage a childs eyes andhe will depend upon the ear for knowledge ofevents occurring around him, and, meantime,the nerve-cells of sight will waste, while thoseof hearing will correspondingly increase. And, finally, the lesson comes home to everyindividual. We recognize tendencies to thought WHO IS INSANE? 103 and action that we know will end, if al-lowed to develop without restraint, in theformation of habits which may entirely changecharacter. These personal peculiarities, ofwhich we are conscious, are quite under ourcontrol for long periods, and even late in life. VII Adolescence. YLl Adolescence jDOLESCENCE is defined to bethe period of life between pu-berty and the full developmentof the frame, extending in manfrom about the age of fourteenyears to twenty-five, and inwoman from twelve to twen-ty-one. It is truly the beginningof the enlarged and perfected life of the individ-ual, or, rather, it is having life more is its real nature and im-Life More port? It marks the developmentAbundantly of a new element in the constitu-tion of the nervous sj^stem. Evenat birth nature had made provision for the per-petuation of the species by implanting in thenervous centres certain cells specifically devotedto that function. They remain dormantuntil adolescence, when they begin to de-velop and take on functional activity. Hithertoyouths, both male and female, associatedfreely together as boon companions, but on 107 108 WHO IS INSANE? reaching the above ages, respectively, a new ele-ment in their conscious relations arises, a sen-timental d
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