rest is in
the use of soft or non-cohesive gold with tin foil. This is no novelty
in practice, but I think that, for the most part, too great a proportion
of tin has been used, and hence has arisen the objection that the tin
dissolved in some mouths. I am satisfied that I myself until recently
employed more tin than was well. I now use from one-tenth to one-twelfth
as much tin as gold, and no disintegration or dissolving away of the
tin ever occurs. I fold the two metals together in the usual way of
folding gold to form strips, the tin being placed inside the gold. The
addition of the tin makes the gold tougher, so that it works more like
tin foil. The packing can be done with more ease and certainty; the
filling, with the same effort, will be harder, and the edges or margins
are stronger and more perfect.

"The two metals should be thoroughly incorporated by manipulation. Then,
after a time, there will be more or less of an amalgamation. By using
about a sixteenth of tin, the color of the gold is so neutralized that
the filling is far less conspicuous than when it is all gold, and I very
often use such a proportion of tin in cavities on the labial surfaces of
the front teeth.

"If too much tin is employed in such cases, there will be some
discoloration of the surface of the fillings; but in the proportion that
I have named no discoloration occurs, and the surface of the filling
will be an improvement on gold in color."

"Dr. Howe. I would like to ask Dr. Lord whether, in referring to the
proportions of tin and gold, he means them to be considered by weight?

"Dr. Lord. No, not by weight, but by the width of the strip of tin and
the width of the strip of gold. I get the proportions in that way, then
lay the tin on the gold and fold the gold over and over, which keeps the
tin inside the gold.

"Dr. Howe. Will Dr. Lord tell us whether he refers to the same numbers
of gold foil and tin foil; as, for instance, No. 4 gold and No. 4 tin?

"Dr. Lord. I use the No. 5 gold, and tin, I think, of about the
same number, but I always use No. 5 gold, both cohesive and
non-cohesive."--_New York Odontological Society Proceedings_, 1893, page
103.

"Tin and gold, in the proportions generally used, do not present a
pleasing color; when finished, it looks but little better than tin, and
after a short time it grows dark, and sometimes black. I use five parts
of gold to one of tin, prepared as follows: Lay down one sheet of
Abbey's