1 6o Hcemajlatks. 
of the Force which this Vein fuftained : Ari 
Allowance in both thefe Cafes is made for the 
different fpecific Gravity of the Blood and 
Water. As there is doubtlefs a very great 
Difference in the Strength of the Fibres of 
young and old Animals, I had intended to 
have enquired in the fame manner, into the 
comparative Strengths, not only of their Ar- 
teries and Veins, but alfo of their Guts. And 
if the Strength of the Periofteum and Liga- 
ments of the Joyncs were tried in the fame 
manner, as in Numb. 2 ^. of this Experiment ^ 
both on old and young Animals, there would 
be found a confiderable Difference. 
II. We fee in thefe Inftances the great 
Strength of the Coats of thefe Veffels ; what 
great Rcafon have we therefore with thankful 
Hearts to fay to our Creator, as holy Job did 
when he contemplated on the wonderful Frame 
and Strength of his Body, Job. x. ii. 7hou 
hajl not on\y fenced me with Bones and Si- 
newSy but haft alfo effcftually fecured the vi- 
tal Fluid, in fuch ftrongly wrought Channels, 
as are Proof againft its moft lively and vigo- 
rous Sallies, when either agitated by the dif- 
ferent Paflions, or by ftrong or brisk Aftions of 
the Body. 
h 
