THE FRED/CABLES. 77 



The predicable GENUS is the relation borne to the subject by 

 a predicate which gives that portion of the connotation which the sub 

 ject possesses in common with other things (the pars determinabilis 

 essentiae}. 



Regarded from the point of view of their denotation, it will be observed 

 that genus and species are correlative, the former being always a wider class 

 within which the latter is included. Hence, from this point of view they are 

 often defined respectively as &quot; a wider class made up of narrower classes called 

 species,&quot; and &quot; a narrower class included in a wider class called the genus &quot;. 

 But the &quot; inclusion &quot; here is not physical inclusion as of coins in a purse, nor 

 mere membership of a miscellaneous collection, as De Wulf s History of 

 Medieval Philosophy among my books, but mental inclusion of one objective 

 concept (species } in another (genus), because the former realizes or embodies 

 in a definite way the mental type which constitutes the latter. 



The predicable DIFFERENTIA may be defined as the relation 

 borne to the subject by a predicate which gives that portion of 

 the connotation the attribute (or group of attributes] which dis 

 tinguishes the subject from other groups of things within the same 

 genus (the pars determinans essentiae : the attribute by which the 

 generic type is determined or definitely realized in the species). 



The predicable PROPRIUM may be defined as the relation borne 

 to the subject by a predicate which gives some attribute (or group 

 of attributes] that follows necessarily from the connotation of the 

 subject. 



The predicable ACCIDENS may be defined as the relation borne 

 to the subject by a predicate which gives an attribute (or group of 

 attributes] that has no necessary connexion with the connotation of 

 the subject. 



46. GENUS AND SPECIES : PORPHYRY S TREE : SPECIES 

 INFIMAE. Genus and Species : It is evident that if we are 

 asked to classify any given class name or general term in one or 

 other of the five predicables we cannot do so except in relation to 

 some other term with which we compare it. And the same term 

 can belong to different predicables according to the nature of its 

 relation to the other term with which it is compared. &quot; Animal,&quot; 

 for Distance, is a genus compared with the two species &quot; man &quot; and 

 &quot; beast,&quot; while it is itself a species (co-ordinate with &quot; plant &quot;) 

 under the genus &quot; living organism &quot;. We saw above (34) how, in 

 an ascending series of widening classes, the extension increases 

 while the intension decreases. In all such series of subordinate 

 classes each is a species of those above it and a genus in regard to 

 those below it. 



