ii. 2 — 11. 3. , 2"] 



fire. Hot substances again are solidified by cold, and, when they 

 consist chiefly of earth, the process of solidification is rapid, and 

 the resulting substance is insoluble ; but, when their main con- 

 stituent is water, the solid matter is again soluble. What kinds 

 of substances however admit of being solidified, and what are 

 the causes of solidification, are questions that have already been 

 dealt with more precisely in another treatise.*"" 



In conclusion, then, seeing that the terms hot and hotter are 

 used in many different senses, and that no one substance can be 

 hotter than others in all these senses, we must, when we attribute 

 this character to an object, add such further statements as that 

 this substance is hotter per se, though that other is often hotter 

 per accidens ; or again that this substance is potentially hot, 

 that other actually so ; or again, that this substance is hotter 

 in the sense of causing a greater feeling of heat when touched, 

 while that other is hotter in the sense of producing flame and 

 burning. The term hot being used in all these various senses, 

 it plainly follows that the term cold will also be used with like 

 ambiguity. 



So much then as to the signification of the terms hot and cold, 

 hotter and colder.^^ 



(Ch. 3.y) In natural sequence we have next to treat of solid 

 and fluid. These terms are used in various senses. Sometimes 

 for instance they denote things that are potentially, at other 

 times things that are actually, solid or fluid. Ice for example, 

 or any other solidified fluid, is spoken of as being actually and 

 accidentally solid, while potentially and essentially it is fluid. 

 Similarly earth and ashes and the like, when mixed with water, 

 are actually and accidentally fluid, but potentially and essentially 

 are solid. Now separate the two constituents in this last instance ; 

 and you have on the one hand the watery part, capable of passing 

 by imbibition into other substances, and this is both potentially 

 and actually fluid ; and on the other hand you have the earthy 

 part, and this is both potentially and actually solid. It is to 

 bodies that are solid in this double manner that the term " solid " 

 is most properly and absolutely applicable. So also the opposite 

 term "fluid" is strictly and absolutely applicable to that only 

 which is both potentially and actually fluid. The same remark 

 applies also to hot bodies and to cold. 



These distinctions, then, being laid down, it is plain that blood 

 649b. 



