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HISTOEY OF DENTAL SUEGERY 163

4 and 5), the instmnient liaving a curve snited exactly to the situation of the
aiJerture, and being soniewliat less in circunifereuce tlian the hole itself."

DESCEIPTIONS OF DB. SNELL 'S SCALERS.

"For the anterior part of the incisors an instrument is sold in the shops,
of a diamond shape, or spear pointed. The one which I use and would
recommend is of a somewhat ditlerent shape, being about a quarter the
breadth, and slightly turned up at the point, and the back of the instrument
rising to an edge, instead of being flat. (Xo. 1). For the posterior part of
the front teeth a pair of instruments are requisite, one for the right hand and
one for the left, instead of the awkward triangular one sold for tliat pur-
pose. * * * The lilade part should be similar to the one for the ante-
rior surface of the teetli, liut considerably smaller and more turned up at
the point. (See the plate Fig .3-3). * * * A thin flat instrument should
be passed between the teeth to remove tlie tartar between their interstices.
Two or three of this kind should 1)e procured, varying a little in shape, breadth,
etc. The insides of the molar teeth reqiiire also a pair of instruments, right
and left, of a different shape from those used for the front teeth, being much
broader, cutting on one side only. * * * (gee plate Fig. 2-2). These six
instruments are essential ; others, however, are occasionally required. * * *