CLASSIFICATION AND THE PREDICABLES. 171 



of all other Kinds to which the individual belongs ; 

 which was the point we undertook to prove. And 

 hence, every other Kind which is predicable of the 

 individual, will be to the proximate Kind in the 

 relation of a genus, according to even the popular 

 acceptation of the terms genus and species ; that is, 

 it will be a larger class, including it and more. 



We are now able to fix also the logical meaning of 

 these terms. Every class which is a real Kind, that 

 is, which is distinguished from all other classes by an 

 indeterminate multitude of properties not derivable 

 from another, is either a genus or a species. A Kind 

 which is not divisible into other Kinds, cannot be a 

 genus, because it has no species under it ; but it is 

 itself a species, both with reference to the individuals 

 below and to the genera above, (Species Praedicabilis 

 and Species Subjicibilis.) But every Kind which 

 admits of division into real Kinds (as animal into 

 quadruped, bird, &c., or quadruped into various 

 species of quadrupeds) is a genus to all below it, a 

 species to all genera in which it is itself included. And 

 here we may close this part of the discussion, and pass 

 to the three remaining predicables, Differentia, Pro- 

 prium, and Accidens. 



5. To begin with Differentia. This word is 

 correlative with the words genus and species, and as 

 all agree, it signifies the attribute which distinguishes 

 a given species from every other species of the same 

 genus. This is so far clear: but which of the distin- 

 guishing attributes does it signify ? For we have seen 

 that every Kind (and a species must be a Kind) is 

 distinguished from other Kinds not by any one 

 attribute, but by an indefinite number. Man, for 

 instance, is a species.of the genus animal ; Rational 



