UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 452 # 
Contribution from the Bureau of Chemistry ‘ S 
CARL L. ALSBERG, Chief 
Washington, D. C. PROFESSIONAL PAPER December 18,.1916 
THE CHEMICAL COMPOSITION OF AMERICAN GRAPES 
GROWN IN THE CENTRAL AND EASTERN STATES. 
By Wiu1am B. Atwoop, Enological Chemist, in collaboration with B.G. HarTMann, 
J. R. Eorr, 8S. F. SHErwoop, J. O. Carrero, and T. 8. Harpina. 
CONTENTS. 
Page. | Page. 
RIDROGINGIODLatemeasere chee 1 | Chemical composition of grapes examined. - 3 
Extent of investigation......../...--------- 1 | Discussion of analytical results............-. 15 
Collection of samples...... .-------.---- by 02 2 | Summary of data on sugar and acid for five 
PE VGOGS eae oe a Ns Pe Ue 16 
INTRODUCTION. 
This report on the composition of native American grapes 1s sup- 
plementary to that published as Bureau of Chemistry Bulletin 145,1 
which contains a general statement of theplansof the work. Although 
final opinion as to the range in chemical composition of the different 
varieties of grapes grown in various districts may require mote 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 1911 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 
1 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. Bul. 145. 1911. 
. 60001°—Bull. 452—16——1 
