2i8 THE SCIENCE OF LOGIC. 



All S is P expressed by S = SP or by Sp = o ; 



Some S is not P 5 &amp;gt; SP Sp&amp;gt;o; 

 NoSisP SP = o 5= Sp; 



Some S is P 



This scheme, as Dr. Keynes remarks, is based on the assumption that 

 particulars imply the existence of their subjects, and that universals do not. 

 This question of the existential import of propositions, and the scheme for ex 

 pressing it, will be discussed in a subsequent chapter. 



JOSEPH, Logic, pp. 198 sqq. KEYNES, Logic, pt. ii., chap. vi. WEL- 

 TON, Logic, bk. ii., chap. ii. 



1 Cf. KEYNES, op. cit. t p. 193. 



