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The Merck Index has appeared in repeated editions since 1889 and hardly needs any introduction to the medical profession. It is a one volume encyclopedia constituting an extensive and almost complete reference work for various drugs and chemical compounds used in the medical sciences. The new edition is similar in format to the previous editions, but enlarged to include all of the new drugs and chemicals which have come into use since the last edition, in 1930. To the complete information on the various chemical compounds and drugs and their formulas, dosage and usage, which appeared in the previous editions, much valuable material has been added, including: a section on the coal tar dyes whose use is permitted in foods, drugs and cosmetics; a table of indicators used for acid-base titration and ph determination; a complete section devoted to the chemical and clinical-chemical reactions, tests and reagents, classified under
The Merck Index. Arch Intern Med (Chic). 1941;67(4):891–892. doi:10.1001/archinte.1941.00200040184016
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