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TABLE OF ATOMIC WEIGHTS.
(Issued December 6, 1890.)
By request of the Committee of Revision and Publication of the
Pharmacopoeia of the United States of America, Prof. F.W. Clarke,
chief chemist of the United States Geological Survey, has furnished a
table of atomic weights, revised upon the basis of the most recent
data and his latest computations. The committee has resolved that this
table be printed and furnished for publication to the professional
press. The committee also requests that all calculations and
analytical data which are to be given in reports or contributions
intended for its use or cognizance be based upon the values in the
table. It would be highly desirable that this table be adopted and
uniformly followed by chemists in general, at least for practical
purposes, until it is superseded by a revised edition. It would only
be necessary for any author of a paper, etc., to state that his
analytical figures are based upon "Prof. Clarke's table of atomic
weights of December 6, 1890," or some subsequent issue.
This table represents the latest and most trustworthy results, reduced
to a uniform basis of comparison, with oxygen=16 as starting point of
the system. No decimal places representing large uncertainties are
used. When values vary, with equal probability on both sides, so far
as our present knowledge goes, as in the case of cadmium (111.
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