CLASSIFICATION. 383 



we find a diagram 1 ' of which the following is nearly a 

 facsimile : 



Y\ ova-la 



et? 





01' 



OV avalcrOtjrov 



\oyiKov aXoyov 

 TOV avOpwTrov. 



In the above scheme we find the bifurcate principle 

 accurately but not completely applied. Each genus is 

 subdivided into two species, described by a pair of posi- 

 tive and negative terms, so that the species are together 

 equal in extent to the genus. But it will of course be 

 observed that each negative branch is left without further 

 subdivision, so that there is only a single infima species, 

 namely man, instead of thirty-two final branches, as there 

 would be in a theoretically complete system. 



This tree was subsequently reproduced in the works 

 of a multitude of logicians in a form which is more 

 complicated and not so good as that of Nicephorus. Thus 

 r ' Epitome Logica, Augustse Vindel.' 1605, p. 118. 



