Transactions . re-volving it any desired length of drill can be slide above sets the giuird at any desired point. Thetriangular sha]>e is simple, easil\-sharpened when dull, andeffective. The Lruard renders the instriunent one of abso-. lute precision, i. e., it can not slip, but only penetrates asfar as the deliberate choice of the operator allows. In cases where a fistula has alread} formed through themastoid or where the outer table is soft or thin and the cellwalls also thin and easilv broken down, I do not thinkthere is much choice in instruments, but unfortunatel} thisis n
Transactions . re-volving it any desired length of drill can be slide above sets the giuird at any desired point. Thetriangular sha]>e is simple, easil\-sharpened when dull, andeffective. The Lruard renders the instriunent one of abso-. lute precision, i. e., it can not slip, but only penetrates asfar as the deliberate choice of the operator allows. In cases where a fistula has alread} formed through themastoid or where the outer table is soft or thin and the cellwalls also thin and easilv broken down, I do not thinkthere is much choice in instruments, but unfortunatel} thisis not always the case. In a collection of Ibrty-six tem-poral bones which I have, there is almost every possible com-bination of air space and bone, and in four of them it wouldbe practicall} impossible to reach the antnun with any sort SUPPURATIVE OTITIS, WITH TWO AUTOPSIES. 439 of instrument without injuring the hiteral sinus ; and in manyoi the others the danger would be very great. So lar as my own experience goes I have tbund the drillespecially useful in cases where there was more solid bonethan air space. The point is sharp and has no tendency to slide over thesurface of the mastoid when it is first revolved. Thesharpness also renders the
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Keywords: ., boo, bookcentury1800, bookdecade1860, booksubjectear, bookyear1868
