30 Hamajlatks. 
Aflcs, Hares, &c. which holds true in the 
Inftance of this Doe's Heart. May not 
one Reafon of this be, that the Fibres of the 
timorous are generally more lax than thofc 
of couragious Animals, on which Account 
the Blood paffing with lefs Refiftance through 
the lax fibred capillary Veflels, it was requi- 
fice that the Heart fliould at each Pulfe 
throw out a greater Quantity of Blood/ in 
order to fupply its more cafy and plentiful 
Flow through the lax capillary Arteries into 
the Veins? And may not this be the Reafon 
why the Pulfcs of young Animals, as of 
Children, are found to beat fafter than thofe 
of grown Perfons, *viz, becaufe the tender 
Fibres of the Coats of their Blood Veflels 
being very lax, they give the lefi Refiftance 
to the flowing Blood ; whofe Globules are 
obferved by Leewenhoeck to be all of a Si2c 
both in great and fmall Animals 5 whcnco 
it was needful to make Provilion for a pro- 
portionably greater Supply of it from the 
Heart, by increafing the Velocity of the Di- 
latations and Contraftions of that curious 
Engine 5 in the Formation of which are feen 
fuch evident Marks of the eonfummate Wif- 
dora of the great Author of Nature. 
4. The 
S 
