Hcemajlatks^ 107 
except the uppermofl:, will have the additio- 
nal Weight of the Plates which lay on them ; 
whence it appears, that the Blood will have 
lefs Weight on it, when fpread into a broad 
thin Expanfe, than when in a larger Mafe. 
38. As the Blood acquires difterent Degrees 
of Warmth according to the different Degrees 
of Velocity with which it is carried on, and 
alfo in proportion to the different Diameters, 
Laxity or Tenfenefs of the Veflels; hence in 
a more lax State of the Fibres of the Veffels, 
the Blood will be cooler, more vifeid, and leQ 
florid and digefted : But mce verfa in a more 
firm and cenfe State of the Coats of the Blood- 
veflels the Warmth of the Blood will be 
the greater, it being in thofe more hale vigo- 
rous Conftitutions, impelled more briskly thro* 
the tenfer capillary Veflels 5 whence a coii- 
ftant greater Warmth and Vigour in thefe 
Conftitutions, and confequently a more high- 
ly digefted and attenuated Blood. But when 
the Heat rifes to the Degree of a Fever, then 
it often putrifies the Blood. 
39. Tho' we cannot on the one hand rea- 
fonably fuppofe, that there is a ftrong repelling 
Degree of Ferment or Effervefcence in the 
Blood, in its healthy State, fo neither on the 
other 
