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4 PREFACE.

ill practice the same end may often be attained by widely different
means, he has deemed it the wiser course to allow freedom of state-
ment to all, sure that at last the truer knowledge will prevail.
It has been found impossible in a work of this character to define
the limitations of each paper so sharply and rigidly as to avoid
all duplication of matter. It Avill, however, be found that if writers
traverse for short distances the same field, they do it from diflPerent
directions and survey it from varying standpoints, often to the reader's
profit ; so that within reasonable limits this defect in the method of
literary collaboration is not an unmixed evil. It has, however, been
restricted to the narrowest possible bounds.

The Editor cannot close this preface without extending to the con-
tributors his heartfelt thanks for their generous co-operation. He
trusts and believes that they will find abundant reward for their
unselfish labors in that satisfaction which ever comes from a good
M'ork well wrought, and in the approval of their professional brethren
everywhere.
His special thanks are due to Dr. James W. White, Editor of the
Dental Cosmos, and also to Professors C. N. Peirce, T. C. Stell-
WAGEN, Henry Leffmann, and Albert P. Brubaker, for counsel
and help which have been of the highest value in the editorial super-
vision of this work.
THE EDITOR.
June, 1886.