of fyeat anD ColD* 43 



the grains or Corpufcles, would keep 

 their agkation from being properly 

 Heat, though by their numerous 

 ftrokes upon a man's face, and the 

 brisk commotion of the fpirits and ci- 

 ther (mail particles that may thence 

 enfue, they may perchance occafion 

 the production of that Quality. 



If fome attention be employ *d in 

 confidering the formerly proposed 

 Notion of the nature of Heat , it 

 may not be difficult to difcern , that 

 the Mechanical production of it may 

 be divers ways effe&ed. For , ex* 

 cepting in fome few Anomalous ca- 

 fes, ( wherein the regular courfe of 

 things happens to be over-turd,) by 

 whatever ways the Infcnjibk parts of 

 a body are put into a very confused 

 and vehement agitation D by the fame 

 ways Heat may be introdue'd into 

 that body : agreeably to which Do- 

 ctrine, as there are feveral Agents 

 and Operations by which this Calo- 

 rific Motion (if I may fo call it) may 

 be excited > fo there may be feveral 

 ways of Mechanically producing 

 D Heat. 



