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FILLING TEETH 45

burnish gold cylinders, No. h size, were used), and
the specific gravity of this filling was 17 '6. The
same cylinders, fully annealed, packed, and con-
densed with a one sixty-fourth of an inch plugger,
were not quite as well adapted as when manipulated
in the unannealed state with the broader plugger.
The specific gravity was IT'l. In making the
hand- pressure fillings greater force was used than
can be employed in the mouth. The object was to
ascertain if the adaptation obtainable with great
hand-pressure could be compared to that produced
with moderate mallet force. The conclusion arrived
at— as already explained—is that a very excellent
—though rarely, if ever, perfect — adaptation is
obtainable with hand-pressure in the mouth, pro-
viding the form of gold, the annealing of the gold,
and the size of the pluggers used are such as lend
themselves particularly well to the attainment of
the desired result. Two good makes of crystal
gold were also tested with mallet force and hand-
pressure, and were found to be almost if not quite
as adaptable as the most favourable forms of foil.
Any slight difference in the adaptation was probably
due to the pieces used being relatively larger than
the pieces of foil.
The specific gravity tests were made in the usual
way by weighing the plugs in air and in water.