Use and Non-use. 125 



Mr. Darwin has, however, applied a special term, 

 that of the "law of correlation," to signify this pro- 

 portionate adjustment. 



136. Moreover, it is noticed that an organ, if long 

 unused, can become reduced in weight and some- 

 what in size; just as by active use it use and Non- 

 may become stimulated and developed. use# 

 Observation has not shown that any unused organ 

 becomes a mere rudimentary structure, as if forsooth 

 non-use or disuse were a morbid affection superven- 

 ing to destroy such local structure. And, as to the 

 effects of use, one limit or condition is imposed by 

 philosophy and common sense; it is that a thing 

 or an organ must be, before it can be used and de- 

 veloped, or can use and develop itself. Yet Mr. 

 Darwin introduces the element of non-use, as a 

 sufficient reason for the disappearance of entire 

 organs into that condition which he calls rudimen- 

 tary, and which we criticized above. And he as- 

 signs the element of use, as an adequate suggestion 

 why a local structure should begin to be; because 

 under the touch and stimulus of environment, the 

 general organism, that comes to want it, uses it and 

 works it by minute degrees into existence. Here 

 you have an instance of the marvelous simplicity 

 which has charmed the minds of men, and won 

 them over to Darwinism, with a magic more potent 

 than logic. 



137. But I am tempted to quote the master of 

 anatomical science, George Cuvier, who in his 



