071 Sal Nitriim and Nitro-Aerial Spirit 105 



result which is due as I have tried to show elsewhere 

 to the motion of nitro-aerial particles. How much 

 greater then will be the effervescence and heat of the 

 blood which abounds in saline-sulphureous particles 

 duly exalted, and with which aerial particles are densely 

 and in their minutest parts mixed by the action of the 

 lungs ? To this I add that the very intense heat which 

 animals experience when urged to violent motion, arises 

 partly because in violent movements there is very 

 great need of increased respiration, and thus the nitro- 

 aerial particles introduced into the blood in greater 

 abundance will produce greater effervescence and heat 

 than usual ; for the friction of the limbs in the most 

 violent movements is not so great as to be able to ex- 

 cite so fervid a heat. Nay, if any one breathes, even 

 when at rest, but a little more intensely, he will soon 

 feel himself in an unusual glow of warmth. However 

 the heat excited in animals by violent exercise is in 

 part also due to the effervescence of nitro-aerial particles 

 and sulphureous particles, originating in the motor 

 parts, as will be pointed out elsewhere. 



I am not unaware that the learned Dr Willis in his 

 treatise on the Heat of the Blood has advanced various 

 arguments by which he endeavours to show that 

 the heat of blood is not due to its fermentation. 

 Ihis eminent man also asserts that liquids never 

 acquire heat in fermenting. But indeed it is evident 

 from common experience that all the thicker and 

 richer liquors, those namely which abound in saline- 

 sulphureous particles, such as strong ale and the 

 like, grow somewhat warm in the course of fermenta- 

 tion. However there is no kinship between any other 

 liquids and the mass of the blood, since the latter is so 

 thick that its particles do not exist in a fluid state 

 -except when fermenting. Hence blood when drawn 



