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This issue is presented in accordance with the original plan to publish a revision every five years. The aim of the work is to include all the approved methods of the association for the analysis of agricultural products and of related substances. The procedures are given in clear, concise statements with no typical analyses. The noteworthy feature is the clarity of composition. The subject matter and arrangement closely resemble those of the third edition. A few unsatisfactory or unimportant methods have been omitted, while other chapters, such as that on beers, wines and distilled liquors, have been expanded. One chapter, "Nuts and Nut Products," which was mentioned in the third edition for future inclusion, has been added. Six other subjects are still being contemplated. Appendix I, dealing with preparation and standardization of solutions, is a valuable addition. The book is an authoritative analytic guide but is not a great improvement
Official and Tentative Methods of Analysis of the Association of Official Agricultural Chemists. JAMA. 1937;108(20):1742. doi:10.1001/jama.1937.02780200064037