CHAPTEK XXXIV. 



MENTAL GKOWTH. 



TISr the last chapter, I have given an account in outline, Analogy 

 -■- of the process by which the mind, like an oroanism, ]>.^^^'^^^^ 

 IS developed by diftereutiation out of a simple germ, ism and 

 The organism is a mass of vitalized matter, having very in d^eloij- 

 complex structvire, and is developed out of a minute "i^"* ''^ 

 structureless mass of gelatinous substance. The mind is tiatiou^' 

 a complex aggregate of conscious and intellectual functions, 

 and is developed out of the germ of sensation. The re- 

 semblance is one of analogy, according to the received 

 definition of analogy, namely resemblance of relations. 

 The mind does not resemble a bodily organism, but the 

 relation of the mental functions to each other resembles 

 the relation to each other of the bodily functions and 

 of the bodily tissues and organs. And this analogy, 

 or resemblance of relations, between the functions of 

 the mind, and the organs of the body, is twofold. They 

 not only agree in the vast complexity of both being de- 

 veloped by differentiation out of a simple germ ; they 

 further agree in this, that as in organic development the Organic 

 more complete is the differentiation, or mutual separa- ?^^^g™"^*^^ 

 tion and nnlikeness, between the various organs, the more tionr 

 complete also is their integration, or mutual co-operation 

 and dependence ; so in mental development : the more 

 complete is the differentiation of mental functions from 

 each other, the more complete also is their integration. 

 As an instance of this mutual dependence, or integration, 

 of mental functions, may be mentioned the fact that pure 



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