THINGS DENOTED BY NAMES. 95 



Several relations, generally called by other names, 

 are really cases of resemblance. As for example, 

 equality ; which is but another word for the exact 

 resemblance commonly called identity, considered 

 as subsisting between things in respect of their 

 quantity. And this example forms a suitable transi- 

 tion to the third and last of the three heads, under 

 which, as already remarked, Attributes are commonly 

 arranged. 



V. QUANTITY. 



$ 12. Let us imagine two things, between which 

 there is no difference (that is, no dissimilarity), except 

 in quantity alone : for instance, a gallon of water, and 

 more than a gallon of water. A gallon of water, like 

 any other external object, makes its presence known 

 to us by a set of sensations which it excites. Ten 

 gallons of water are also an external object, making its 

 presence known to us in a similar manner ; and as 

 we do not mistake ten gallons of water for a gallon of 

 water, it is plain that the set of sensations is more 

 or less different in the two cases. In like manner, a 

 gallon of water, and a gallon of Madeira, are two 

 external objects, making their presence known by two 

 sets of sensations, which sensations are different from 

 each other. In the first case, however, we say that 

 the difference is in quantity ; in the last there is a 

 difference in quality, while the quantity of the water 

 and of the Madeira is the same. What is the real 



one disease, but believe (if we may credit the accounts given) that 

 the small-pox is a goddess, who becomes incarnate in each infected 

 patient." Logic; Appendix on Ambiguous Terms, p. 298. My 

 references to this work are always to the first edition. 



