UNITED STATES DEPARTMENT OF AGRICULTURE 



Contribution from the Bureau of Chemistry 

 CARL L. ALSBERG, Chief 



s\j9*^jru 



Washington, D. C. 



PROFESSIONAL PAPER 



December 18, 1916 



THE CHEMICAL COMPOSITION OF AMERICAN GRAPES 

 GROWN IN THE CENTRAL AND EASTERN STATES. 



By William B. Alwood, Enological Chemist, in collaboration with B. G. Hartmann, 

 J. R. Eoff, S. F. Sherwood, J. O. Carrero, and T. S. Harding. 



CONTENTS. 



Page. 



Introduction 1 



Extent of investigation 1 



Collection of samples 2 



Page. 

 Chemical composition of grapes examined. . 3 



Discussi3n of analytical results 15 



Summary of data on sugar and acid for five 

 years 16 



INTRODUCTION. 



This report on the composition of native American grapes is sup- 

 plementary to that published as Bureau of Chemistry Bulletin 145, 1 

 which contains a general statement of the plans of the work , Although 

 final opinion as to the range in chemical composition of the different 

 varieties of grapes grown in various districts may require moie study, 

 the values commonly found are indicated by the results given in these 

 two reports. 



EXTENT OF INVESTIGATION. 



Fewer samples were handled at the Sandusky and Charlottesville 

 laboratories during the season of 19 11 than in the two previous years, 

 but care was taken to secure representative samples of the varieties 

 analyzed. The field work in 1912 was devoted to other questions 

 than variety examinations. 



In 1913 the work was largely transferred to new territory and to 

 districts not adequately covered in previous years. The collection 

 and analysis of samples were limited to samples from New Jersey 

 and New York for table and wine grapes and to samples of the 



i Alwood, William B. Enological Studies, No. 4. The Chemical Composition of American Grapes 

 Grown in Ohio, New York, and Virginia. U. S. Dept. Agr. Bur. Chem. Bui. 145. 1911. 



60001°— Bull. 452—16 1 



