13 2 Of viewing the Current 
whfereas the cool Dews of the Evening ren¬ 
der them mold and pliable j which makes 
them chufe that Time to come abroad. 
F 
In viewing feveral of the Objects here 
mentioned, one fhall often obferve the Blood 
paffing through Velfels fo minute, that the 
Globules of it cannot glide along otherwife 
than fingle, and fqueezed into oblong Forms: 
yet an hundred of the red Globules of fuch 
Blood, if placed clofe to one another in a 
Row, would not equal the Length of the 
Diameter of a large Grain of Sand; and 
corifequently a Million of them exceeds not 
a Grain of Sand in Bignefs 
The Effects of Heat and Cold upon the 
Blood are wxll worth taking Notice of: for 
as Heat relaxes the Veffels, the Blood finds 
siib'fe Room to move ini its Globules float at 
greater Diftances, and it circulates more 
freely 1 whereas Cold fo contracts the Vef¬ 
fels, that the Globules are comprefi: toge¬ 
ther, and the Blood is impeded, and in fome 
Degree coagulated in the minute Capillary 
Veins arid Arteries of the extreme Parts ; as 
is evident from the Swelling and Blacknefs 
of the Hands and Feet when expofed to fe- 
vere Cold. 
Leeuwen, 
6 
An. Nat. Tom. I. Part f. p.35. 
Before 
