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This Spina ventofa was treated nearly in the fame 
manner as the above mention'd, and the Cure per- 
formed as follows. It was enter'd upon th 7th of 
November , by making an Incifion to the Bone upon 
the external Part of the Arm, about fix Inches long, 
and one broad, beginning it above the Place in the 
Bone where the "Deltoid Mufcle is inferted j but, 
on the Side of it, almoft down to the Supinatores 
Radii 5 and then, by deftroying with the Lapis in- 
fernalis all the Flefh growing on the Exoftojis or 
callous Expanfion incompafllng round, and, as it 
were, incafing the carious Bone, which the next Day 
being feraped off, the fiftular Opening leading into 
the medullary Cavity then came in View, and the 
Probe going a great way therein, I immediately pro- 
ceeded to the trepanning of the Bone, and inlarging 
that fiftularOpening into it with the exfoliativeZr^#, 
perforating through the callous Expanfion or Ex o f- 
tojis , which was fpread externally almoft a Quarter 
of an Inch upon it, quite into the medullary Cavity. 
The next Day I applied this Inftrument above and be- 
low the preceding Perforation 5 and, by cutting and 
paring off the Angles betwixt them and the Sides of 
the Perforations, with an Inftrument the Engravers 
make ufe of, then made a fair Opening into the me- 
dullary Cavity of the Bone, and a convenient one 
too ; for the Difcharge of the Matter hitherto con- 
fin'd within it, which, whilft pent in, had occafion'd 
the Cariofity, and the Progrefs of if, now found to 
have deftroyed above four Inches of its Body 5 and 
alfo for the Removal of the Fragments and loofe 
Bones confined in the medullary Cavity, and the Ap- 
plication of the nccefiary means, as well to flop the 
Progrefs 
