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REPLIES TO CEITICISMS. 



in disclosing the trutns of the Abstract Sciences. Subse 

 quently he re-raises this apparent anomaly when saying 



&quot;Nor is it possible to justify the placing of Psychology wholly 

 among Concrete Sciences. It is a highly analytic science, as Mr. 

 Spencer thoroughly knows.&quot; 



For a full reply, given by implication, I must refer Prof. 

 Bain to 56 of The Principles of Psychology, where I 

 have contended that &quot; while, under its objective aspect, 

 Psychology is to be classed as one of the Concrete Sciences 

 which successively decrease in scope as they increase in 

 speciality; under its subjective aspect, Psychology is a 

 totally unique science, independent of, and antithetically 

 opposed to, all other sciences whatever.&quot; A pure idealist 

 will not, I suppose, recognize this distinction ; but to every 

 one else it must, I should think, be obvious that the science 

 of subjective existences is the correlative of all the sciences 

 of objective existences; and is as absolutely marked off from 

 them as subject is from object. Objective Psychology, which 

 I class among the Concrete Sciences, is purely synthetic, so 

 long as it is limited, like the other sciences, to objective 

 data ; though great aid in the interpretation of these data 

 is derived from the observed correspondence between the 

 phenomena of Objective Psychology as presented in other 

 beings and the phenomena of Subjective Psychology as pre 

 sented in one s own consciousness. ISlow it is Subjective 

 Psychology only which is analytic, and which affords aid 

 in the development of Logic. This being explained, the 

 apparent incongruity disappears. 



A difficulty raised respecting the manner in which I have 

 expressed the nature of Mathematics, may next be dealt 

 with. Prof. Bain writes : 



&quot; In the first place, objection may be taken to his language, in 

 discussing the extreme Abstract Sciences, when he speaks of the 

 empty forms therein considered. To call Space and Time empty 



