i! (ii United Stales Government 



Issued August 25, 1908. 



United States Department of Agriculture, 



BUREAU OF CHEMISTRY Circular No. 40. 

 H. W. WILEY, Chief of Bureau. 



METHODS FOR THE ANALYSIS OF MAPLE PRODUCTS AND THE 

 DETECTION OF ADULTERANTS, TOGETHER WITH THE INTERPRE- 

 TATION OF THE RESULTS OBTAINED. 



By A. HUGH BRYAN, 

 In Charge, Sugar Laboratory. 



INTRODUCTION. 



This circular contains a compilation of the methods of analysis of 

 maple products prepared for the convenience of food analysts, 

 together with such a discussion of the average results obtained as 

 may serve to guide others in the interpretation of their results and the 

 use of the methods. In the preparation of this circular the following 

 authorities have been consulted freely, in some cases the methods 

 being given exactly as in the original, while in others modifications 

 suggested by work in the Sugar Laboratory have been introduced: 

 The work of C. H. Jones and his assistants as published in the Seven- 

 teenth and Eighteenth Annual Reports of the Vermont Agricultural 

 Experiment Station (1904-5); Julius Hortvet's article on "The 

 Chemical Composition of Maple Sirup and Maple Sugar Methods of 

 Analyses and Detection of Adulteration," published in Journal of the 

 American Chemical Society, 1904, volume 26, page 1523, and a paper 

 by A. L. Winton, entitled U A Method for the Determination of the 

 Lead Number in Maple Sirup and Maple Sugar," published in the 

 same journal in 1906 (volume 28, page 1204). The correlation of 

 this work and its publication in one place it is thought will be of 

 considerable convenience and value especially for those engaged in 

 food inspection work. 



Respectfully, H. W. WILEY, 



Chief of Bureau. 

 Approved : 



JAMES WILSON, 



Secretary of Agriculture. 

 WASHINGTON, D. C., July 6, 1908. 



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