4 The Natural Hi(iory Part !¥• 



Men and other Animals. In a Phyfa^ 

 logical Treat if ey which I have by me, 

 concerning the Strn&ure and Vfe of the 

 Farts of Animals , difcourfing of the 

 Lungs, I fliew that they are the grand 

 Emunftory of the Body : that the maioi 

 End of Refpiration is continually to dif- 

 charge and expell an excrementitious 

 Fluid out of the Mafs of Blood : and! 

 prove from feveral Experiments that 

 there pafTes out of the Body a greater^ 

 quantity of Fluid Matter this way, 1 

 mean upwards, and through the Lung^i 

 than there does of Urine^ by the Ki^S 

 meys ^ downwards. Now the Fluids- 

 which is thus fecreted, and expired 

 forth along with the Air, goes off with 

 it in infenfible parcels, in the Summer 

 Seafbn^ when the ambient Air contains 

 Heat enough to bear it quickly away, 

 and fb difperle it. But in the Winter, 

 when the Heat without is left, it oftenr 

 times becomes fo far condenfed as to 

 be vifible, flowing out of the Mouthy 

 in form of a Fugme, or crafler Vapour 

 and may, by proper VefTels, fet in a 

 ftrong freezing Mixture, the better to 

 eondenle this Vapour, be colleded in 

 confiderable quantity. But to return^ 

 That 'tis npt wiihout a very extraordi- 

 ' nary 



