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246 APPENDIX
between its weight in air and its apparent weight in
water. The vaseline was removed from the fillings
by treatment with petroleum ether in a Soxhlet
apparatus for three hours. After removal of the
petroleum ether by heating to 100° C, the fillings
were weighed. Having thus measured the volume
of the filling and determined its Aveight, we get at
once the " dental " specific gravity.
ARTHUR SMITHELLS.
December 1903.
