('1184) 
linmune larfgs wind thofeot ^iadr^peJs, when we confidcr 
the Blood of their Lungs mart return to the Heart in equal 
lime and ^arrtiiy, with that, of all the parts ot the Body 
befides, ^is before noted. Hence it appears the Bronchial 
, Blood Veflels (firft taken notice of by the Accurate Ruyfch) 
are abfolutely neceflary, elfe the parts of the Lungs could 
not receive nourifhment ^ nor could the. Glands of the 
Bronchr£ feparate their Liquor, if they were fupplied 
with Blood from the Pulmonick Blood Veffels vphlch is fo 
quickly difpatched thro the Lungs. 
On viewing the Membrane, that is between the Toes 
of one of the hinder Feet of a living Frog, after I had fre- 
quently fitken hold of the fame Leg of that Creature, 
to apply it to the Microfcope, I found that Membrane very 
tranfparept, and without any motion of the Globules of 
the Blood in it, as if the part had been dead ^ but while I 
was looking on it,it was, I confefs,not a little entertaining to 
fee the Globules creep into it by degrees, and at length the 
Blood move in all the Branches of its Veif7s and Arteries as | 
before, when no violence had been offered to the part : 
While the Blood is thus leifurely creeping through the 
the Veffels, you may plainly fee its Globules comprefk 
into Oval Figures, which are made more .or lefs ob^ 
long, by the refiftance thofe Globules meet with, by the 
contradion of the fides of the Veffels they pafs through 5 
and this I have more than once obfcrved in the tails of the 
Water Nevptsov Lizzards : But on examining the Blood of | 
thefc Creatures with a Micro(cope,and comparing it with the ^ 
Humane Blood, I found the Globules of the Lizzards 
Blood more incline to an oval Figure, and were as big ^ 
again as the Globules of Humane Blood, and that of a 
fmall Fi(h ^ which I in like manner viewed at the fame 
time. It is not unlikely a fndden retroceflion of Blood 
from the eiKtrernities of its Veffels often happens, aud its 
Circulation in the fame Veffpls, is afterwards carried on 
without any impediment 5, as on fome Paffions of the 
Mind, 
ill 
