C j*» 3 
Matter, the tranfverfe or conneding Fibres will the 
fooneft give way, and the Cartilage becomes more 
or lefs red and lofr, &c. If the Diforder goes on a 
little longer, the Cartilage does not throw off a 
Slough, but feparates from the Bone, where the 
Force of Cohefion is leaft, and where the Difeafe 
foon arrives, by reafon of the Thinnefs of the Car- 
tilage. When the Bone is thus expofed, the Matter 
of the Ulcer, or Motion of the Joint, corrodes or 
abrades the bony Fibres. If the Conftitution is good, 
thefe will {hoot forth a Callus \ which either cements 
the oppofite Bones of the Articulation, or fills up the 
Cavity of the Joint, and for the future prevents Mo- 
tion. But if, unfortunately, the Patient labours under 
a bad Habit of Body, the Malignancy, having got 
Root in the Bone, will daily gain ground, the Ca- 
ries will fpread, and at laft the unhappy Perfon mud 
fubmit to Extirpation, a doubtful Remedy, or wear 
out a painful, though probably a fhort Life. 
Explication of the Figure. 
Figure i. Tab. IV. Reprefents a View of /^Patella 
on the Backfide , where it is covered with a 
fmooth Cartilage. In this we may obferve y 
AAA A. The Surface of the Cartilage , appearing , 
when the Perichondrium is removed , like Velvet. 
Near the Middle , j Fart of the Cartilage is taken 
out y in order to fbew 
B. The fubjacent Surface of the Bone: And 
C. The Thicknefs of the Cartilage , where the per - 
pendicular Fibres are feen very diftinlily. 
D. The fcabrous lower Toint of this Bone , into which 
the Ligament is inferted that binds it to the Tibia. 
V y y VIL Tart 
