By direction of the Secretary of Agriculture, the matter contained herein is published as administrative information and is required for the proper transaction of the public business The reports of research published in this magazine are necessarily qualified by the conditions of the tests from which the data are obtained. Whenever it is deemed possible to do so, generalizations are drawn from the results of the tests; and, unless this is done, the conclusions formulated must be considered as

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... ecifically pertinent only to the described conditions