CHAPTER III. 
tilagcs, which join the ribs and flernum, fometimes one cartilage fencing 
two ribs, and fometimes a cartilage not joined to any rib; frequently in 
old perfons we find parts of them ofiificd, and I have twice found them 
totally ollified in men between forty and fifty years of age, both of which 
died with a great difficulty of breathing; and befides, one had a jaundice, 
and the other a dropfy, but the lungs in both were very found. 
There are feldom found fewer than four and twenty vertebrae in the 
fpinc, befides the os facrum, but often more; fometimes thirteen of the 
back, with as many ribs of a fide; and fometimes fix in the loyns: And 
in fome bodies two ribs from the firfl: vertebra of the loyns; but then it has 
wanted tranfverfe procefles. 
Os innominatum (Tab. xviii.) is in young perfons compofed of three 
bones, the upper is named ilium, the lower and pofterior os ifehii, and 
the anterior os pubis; the upper edge of the ilium is called its fpine, the 
anterior part of the fpine its apex, and a little lower is the proceffus inno- 
minatus. Ilium has two proceffes, the one named the obtufe procefs, and 
the other the acute; in the center of thefe bones is the acetabulum or 
locket for the thigh bone; in the bottom of which focket is another ca¬ 
vity, in which lies the lucribating gland of this joint. 
