( f0‘ ) 
ipf arum magnttudine, ttt-in defunffa pudla obfervavi : in 
qua Lien globulis confpic uis racematim difperfis lotus [cat chat. 
Which Cafe was the very fame with mine. 
The fecond Obfervation. We* had dill been in the 
Dark, about the nature erf a Luxation of the Head of the 
Thigh Bone, had we not carefully examined the Part in 
the dead Body. For by that fort of enquiry, the com- 
mon midake of Surgeons was detedled, and what was 
edeemed and treated by them as a Luxation of the Head 
of the Femur, was difeover’d to be nothing elfe but a 
Fra&ure of the fame Bone, near its Neck ; the globular 
Head being dill retained clofe in its own Socket, called the 
Acetabulum Coxendicis. 
Amongft all the Writers of Surgery and Anatomy, I 
know but three that were apprifed of this midake.** the 
firft was Ambrofe -Pane, the lecond Dr. Ruyfch at Amfler - 
dam, and Mr Chefelden , a Member of the Royal Society ; 
wnofe Obfervations on this Subjedt 1 intend to commu* 
nicate at another time, together with an account of the 
true Structure of this Joint; in which I will confider the 
depth of the Articulation ; the wonderful drength of the 
Mufcles that furround it ; the many flrong ligaments that 
bind the Head within the Socket •, the fmallnefs of the 
Neck of the Bone ; its poreous and fpungy Subdance, 
which makes it much weaker than the reft ; and lad of 
all the difadvantageous oblique pofition of this Neck, 
which expofes it the more to outward accidents. From 
a review of fuch like Confiderations, it will plainly appear 
that a Fradture can much more eafily happen, than a Dido* 
cation in that Part from an external Cftule. 
This Os ftmoris belonged to an old Woman turn’d of 
Fourfcore, who only fell from her Chair whereon die was 
fitting, and thereby differed this breach of continuity in 
rhe Subdance of the Bone. She lived three Weeks after 
it; and tho’ it never was reduc’d, yet die complained of 
H h h h very 
