PARTS OF ANIMALS, II. ii.-ui. 



things that have passed through a process of com- 

 bustion have heat in them, such as cinder, ash, the 

 excrement of animals, and bile (an instance of a 

 residue). These have passed through fire and some 

 heat is left behind in them. Firwood and fatty 

 substances are hot in another way : they can quickly 

 change into the actuality of fire. 



We must recognize that " the hot " can cause both 

 congealing and melting. Things that consist of 

 water only are solidified by the cold, those that con- 

 sist of earth, by fire. Again, hot things are solidified 

 by cold : those that consist chiefly of earth solidify 

 quickly, and the product cannot be dissolved again ; 

 those that consist chiefly of water can be dissolved 

 after solidification. I have dealt more particularly 

 Mith these matters in another work,'' where I have 

 stated what things can be solidified, and the causes 

 that are responsible for it. 



So, in view of the fact that there are numerous 

 senses in which a thing is said to be " hot " or "hotter," 

 the same meaning -w-ill not apply to all instances, but 

 we must specify further, and say that A is hotter 

 " of itself," B perhaps " by accident " ^ ; and again 

 that C is hotter potentially, D actually ; and we 

 must also say in what way the thing's heat manifests 

 itself: e.g. E causes a greater sensation of heat when 

 touched ; F causes flame and sets things on fire. 

 And of course, if " the hot " is used in all these 

 senses, there will be an equal variety of senses 

 attaching to " the cold." 



This will suffice for our examination of the terms 

 " hot " and " cold," " hotter " and " colder." 



III. It follows on naturallv after this to discuss (?»" solid " 

 "the solid" and "the fluid " '^ on similar Unes. ""^"^"''^•' 



129 



