172 Hczmajiatks. 
which is therefore doubtlefs, among other u- 
fes, of great Importance in ftrengchcning the 
Bones to which it moft clofely adheres. The 
Circumference of the Bone where the joining 
Symphyjis was forcibly feparated, was about 
four Inches, fo that the Strength of one fquarc 
Inch of the Periojleum is equal to the Force of 
one hundred Pounds Weight, which Strength 
is much greater than the above found Strength 
of the Coat of the Arteries and Veins ; the great 
Author of Nature ever proportioning the 
Strength of all the Parts of the Body to the 
feveral Offices they are to perform. 
31. I forcibly pulled afunder in the fame 
manner the Hock Joint of one of thofe Legs, 
having firfl: taken off the Mufcles and Ten- 
dons. Whereby I found the Strength of the 
Ligaments with which that Joint was braced, 
to be equal to the Force of eight hundred and 
thirty Pounds Weight : So great Care has 
Nature taken to prevent the Luxation of the 
Joints, and fo ftrongly are 'wc fenced u'ith Boms 
and Sinews^ Job x. n. 
33. As a Force equal to five hundred and 
fifty Pounds was found requifite to feparate the 
abovementioned joining Symphyjis, fo in the 
Growth of the Bone lengthwife at that Join- 
