SYSTEMATIC ANALYSIS OF APPARATUS. 97 



it be itself warmed; it can be, 1st, by the action of 

 the organs themselves, which always produces heat ; and 

 2d, by receiving substances that are burned in it ; also, 

 if it move around rapidly it will distribute as well as 

 produce heat more rapidly. This important result can be 

 gained by having its motion quickened, or its quantity 

 lessened by removing its water, for that does not dimin- 

 ish its heat-producing substance ; the result will be still 

 greater if its motion is quickened and its water lessened 

 at the same time. Therefore, there should be connected 

 with its circuit an organ that can rapidly remove water 

 without evaporating it, or causing thirst ; for if that exist, 

 water will be drank, and no more heat be produced than 

 before. 



350. THE BLOOD CAN COOL THE ORGANS through 

 which it passes, if it is itself cooled, as it can be if it 

 receive substances that prevent the production of heat, 

 if it be largely diluted, and if it have associated with it 

 an organ that can take from it water, and evaporate it, 

 and at the same time cause thirst; for unless it exist and 

 induce drinking, the blood will not be sufficiently diluted. 



351. IT is EVIDENT that, as the different mentory 

 organs are composed of different substances, their ac- 

 tion must excrete into and draw from the blood different 

 substances. 



352. IT WOULD BE NATURAL TO SUPPOSE that differ- 

 ent and corresponding organs would be required to elim- 

 inate the different excretions, as well as different organs 

 to supply the different substances necessary for nutrition, 

 warming, cooling, etc. 



353. DIFFERENT CORRESPONDING ORGANS DO EXIST, 

 at least to a certain extent, for eliminating the substances 

 excreted by the action of the mentory organs. 



354. THE KIDNEYS HAVE BEEN CONSTRUCTED with 

 reference to eliminating from the Blood the substances 



Why should thirst not exist when the Body is too cool ? 850. How 1 

 851. What ? 352. What ? 353. Do ? 854. How ? 



