ATROPHY. 287 



affected with disease, or when the general nutrition of the body is 

 reduced. Both these causes operate in the general condition known 

 as " senile atrophy." 



More obscure forms of atrophy are those which appear to be 

 occasioned by lesions of trophic nerves, or are caused by toxic con- 

 ditions ; e. g., lead-poisoKJr/g. 



