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Cold. This Compreffion or Contradtion 
of the Air is twofold, i. From the Preflure 
of the Water ; for though the Air be com- 
preffible, yet Water is not. 2. From the 
Cold, which inftantly reduces the Air in 
the Blood to lefs Space 5 but to how much 
lefs, the Spirits in the Thermometer fhow 
us with Certainty. But we have no exadt 
Method to meafure the certain Degree of 
Stimulus imprefled on the Solids. 
Having fo far feen the viflble and de- 
monftrable EfFedts of the Cold Bath, we 
may in fome meafure be able to compre- 
hend the Reafon of it, for the reverend 
and ingenious Mr. Hales ( Statics , Vol. I. 
p. 299, 300) has proved that Air exilts 
in a much larger Proportion in the Solids 
of either Animals or Vegetables, than in 
their Fluids. And 1 . Since upon the Com- 
preffion of this expanded Air, the confti- 
tuent Parts of the elaftic flexible Solids arc 
brought nearer to one another, fo much 
larger is their Point of Contadt, their Co- 
hefion is ftronger, and they adt with greater 
Force. On the contrary, the more ex- 
tended a Fibre or Veflel is; the fmaller its 
Point of Contadl, the nearer are its Parts 
to Separation, or Lofs of Continuity, and 
the 
