" Clear and distinct ideas are terms which, though familiar and 

 frequent in men's mouths, I have reason to think every one who 

 uses does not perfectly understand. And possibly it is but here 

 and there one who gives himself the trouble to consider them so far 

 as to know what he himself or others precisely mean by them ; I 

 have, therefore, in most places, chose to put determinate or deter- 

 mined, instead of clear and distinct, as more likely to direct men's 

 thoughts to my meaning in this matter." LOCKE'S Essay on the 

 Human Understanding ; Epistle to the Reader. 



" According to this view of the process of the mind, in carrying 

 on general speculations, that Idea which the ancient philosophers 

 considered as the essence of an individual, is nothing more than the 

 particular quality or qualities in which it resembles other individuals 

 of the same class ; and in consequence of which, a generic name is 

 applied to it/ D. STEWART, Phil, of the Human Mind, ch. iv., sec. 2. 



. " Deux grandes notions philosophiques dominent la theorie fon- 

 damentale de la methode naturelle proprement dite, savoir, la forma- 

 tion des groupes naturels, et ensuite leur succession hierarchique." 

 COMTE, Cours de Philosophie Positive, 42me legon. 



