Year: 1868

in assigning a name or chemical symbol to
this production. To make the gum color
natural and flesh like is the point 'ercet-
teHce with manufacturers of artificial dem
lures We suppose that the truth is that
its purplish hesh-color which makes it so
desirable, is impaired to it by the admix.
ture of some substance in the body Of
the tooth upon which it is burned. Some
manufacturers make this purple of Cassius
by melting their gold, tin, and silver in a
crucible This is called preparing it in the
dry way, and some make it py dissolving
the metals in acids, which is called the hu-
mi" process. In any way it is uncertain
and undetermined, and when a good lot
is made the manufacturer reioiceth vastly


The crude feldspar is scattered in patches
all over the globe, but the best quality used
in the United States is brought from the
quarries in Delaware County Pennsylvania.
The kaoliu which is neither more nor less
than disintegrated feldspar, is procured
from the same places. 1t may be necessary
to say that the feldspar contains about four
teen per cent of potash, which it loses in
the process of disintegFation; consequently
kaolin, or petiatze, as the Chinese call it, is
feldspar deprived of its alkali The silex is
too common to need explanation, as its re-
AdAAbuSt uluts uudAlAs Gdu1 NkCt1 dAC ulluCt
every ones heels


The spar is quarried, brought to the fac.
tories in barrels, heated in a furnace, and
the calcination is completed when it is
thrown into the water Next it is ground
in water, and kept standing in vessels for
two or three years, during which time a
film rises upon the surface of the water
which emits a stencil not pleasant 10 dainty
noses. 1--WE are told that the feldspar is
kept in water in the Imperial Porcelain Chi
nese manufactures for three hundred
years y 1t is next dried, and after being
mixed with the silex and kaolin is about the
consistency of putty; is pressed into the
mOlds and takes the form of the block or
single tooth, and placed upon clay slides
and "biscuited; l. G., heated to a degree
which makes it hard enough for the work
men to trim the edges of the teeth or blocks
and vet not sufficiently hard to become
fused, OF vitrifed After the edges are
trimmed off, they are dipped in a glass and
replaced upon the slides and are returned
to the muffle where they are again heated
to about 1000 degrees, and when properly
vitri6ed, are taken out and annealed very
slowly. This last process demands expert
ence and good judgment. Like all other
kinds Of glass, porcelain teeth that are not
carefully anneaed are worthless. When
the teeth have been properly made, and all
the essentials Of strength and beauty have
received due attention, they are as translu-
cent as the finest Chinese Porcelain, and as
tough as iron-stone | have avoided details
as it is not my purpose to instruct in this
business, but rather to call attention to the
rapid rise of this noticeable feature in Amer
lean manufactures


Forty years ago you could have your face
shaved, your tooth drawn, and your boots
blackened, in the same place, by the same
hand. Now you are uShured into an ele-
CANT Office, seated in a chair easier than
that of Helogabalus, and your alveolar
ridges are examined by man whose attain
ments would reflect honor upon any profess
sion. Scientific american,