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This is the latest edition of the methods recommended for "official" analyses of some drugs, most foods, common insecticides, some cosmetics and the chief vitamins. The methods were developed through an extensive program of cooperative testing and are practically foolproof. The chemists belonging to the association, i. e., those who developed the assay procedures, are those employed by city, state and federal departments of agriculture and agencies concerned with the enforcement of laws relating to foods, drugs, fertilizers, feeds, insecticides and fungicides. Eighty pages of tables in the back of the work make it self contained. There is an excellent index.
A 1951 study studied this question.