66 
Hcefnajlatics. 
of thofe Vcflels, will be part of the whole 
Expanfe of the 4.34 Pounds of Blood, and 
confcquently a Qtiantity of Blood equal to 
27.9 times the Capacity of thofe Veffcis muft 
pals thro* them in a Minute. Whence we fee 
by this Cilculation, as well as by the above- 
mentioned fmall Proportion that the Lungs 
bear to the reft of the Body, that the Velo- 
city of the Blood muft needs be very much 
accelerated in them. 
8 . When we view in a ftrong Light the 
Blood circulating in the Lungs of a Frog, 
we fee the Arteries as they pafs on, fending 
Branches, which fpread like a fine Net-work 
over the Surface of each Veficle ; and on fome 
of thefe Vcficles, we may very plainly fee, the 
Blood when it has pafs*d over little more than 
half their Surfaces, to enter correfponding ca- 
pillary Veins, which thence unite in large 
Trunks 5 but on the greateft part of the Ve- 
ficles, the excream capillary Arteries, reach 
to the Verges of the Veficlcs, and there en- 
ter at right Angles the Veins, which run a- 
long the Limits of thofe Veficles ; which 
Veins laying on the inner Sides of thofe Ve- 
liclcs they are not vifible like the Arteries: But 
when in here and there a Place I have clear- 
ly 
2. 
