XXXIV.] MENTAL GROWTH. 91 



It is to be observed that the law of the fading away Forgetting 



,,. . . , ., 1J.- is a case of 



of mental impressions is not an independent primary ^j^g j,^^g 

 law. It is a case of that law of habit in virtue ofofliabit. 

 which all vital tendencies, whether organic or mental, 

 gradually disappear when nothing occurs to call them 

 into exercise.^ 



1 See the chapter on the Laws of HalDit (Chapter XV.). 



