When the present authors entered govern in essence a modern version of Leach . It mental service, food chemists looked for differs from that book in that familiarity with the everyday practices of analytical chemistry, guidance to one book, Albert E. Leach’s Food Inspection and Analysis, of which the fourth and the equipment of a modern food labora tory, is assumed. We have endeavored to revision by Andrew L. Winton had appeared in 1920. Twenty-one years later the fourth bring it up-to-date both by including newer (and last) edition of A. G. Woodman’s Food methods where these were believed to be superior, and by assembling much new Analysis, which was a somewhat condensed text along the same lines, was published. analytical data on the composition of In the 27 years that have elapsed since the authentie sam pies of the various classes of appearance of Woodman’s book, no Ameri foods. Many of the methods described herein can text has been published covering the same were tested in the laboratory of one of the field to the same completeness. Of course, authors, and several originated in that editions of Official Methods 0/ Analysis 0/ the laboratory. In many cases methods are accompanied by notes on points calling for Association 0/ Official Agricultural Chemists have regularly succeeded each other every special attention when these methods are five years, as have somewhat similar publica used.