/ 
Hcemajlatics. 69 
'Only fee it (enfibly accelerated at each Syjtole 
in the finefl: capillary Arterie5r,- but alfo in their 
correfponding capillary Veins, cho’ not in their 
larger Trunks. 
15. And as a Frog’s Heart has but one 
Auricle and Ventricle, the Blood is thrown 
by the fame Ventricle, at the fame inftant, 
both into the Lungs and all over the Body • 
then fince its Velocity is in Arteries of e- 
qual Diameters, forty three times greater in 
the Lungs than in the Mufcles, notwichftand- 
ing it is impelled, by one common Impetus; 
this evidently (hows, that it mufl have pro- 
portionably freer PafTages through the Lungs; 
and confequently fince it has a freer Paffagc, 
xhe Heat which it there acquires, by Fridion 
againft the Coats of the Veflels, will not be 
incrcafed in proportion to its greater Velocity 
there, than in other Parcs of the Body, but 
in fome other intermediate proportion ; for as 
the Blood meets with greater Refiftance in 
pafTing from the Arteries to the Veins in o- 
ther Parts of the Body, fo were its Velocity 
equal in all Parts of the Body, it would ac- 
quire the greateft Heat, where it met with 
the greateft Refiftance and Friftion, which 
would not in that cafe be in the Lungs : But 
F 5 
as 
