Hcemajlatks. 97 
nble capillary VefTels of the Body, efpecially 
thofe of the Lungs : Yet as elcftrical Bodies 
acquire greater Degrees of Eledlricicy when 
rubbed in a cold than in a hot Air, fo it is rea- 
fonable to think that the Globules may acquire 
confiderable Degrees of elaftic Vibrations in 
pafling the Lungs : For while by the extraor- 
dinary Fridions they there undergo, they are 
much heated and dilated, they are at the fame 
time refrigerated and contrafted by the frefli 
Air that is continually taken into the Lungs : 
Where, by reafon of the great Expanfion of 
the Surfaces of all the Veficles of the Lungs, 
a very large Surface of the Blood is expos'd to 
an equally large Surface of Air contained in 
thofe Veficles, whofe Coats are fo extreamly 
thin, that thofe two Fluids are fuppofed to be 
•j^th part of an Inch within Contaft of each 
other, fo that like blended Liquors, they muft 
needs have a confiderable Efl'etl on one ano- 
ther, the Air in cooling the Blood, and the 
Blood in warming the Air. 
14. Which EfFed of the Blood on the Air 
in the Lungs is fo confiderable, that tho' that 
Air is by Infpirations blended with a good 
Qiiantity of frefli cool Air, no lefs than 1200 
times in an Hour 5 yet by holding the Ball 
‘ H of 
