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UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 591 
Contribution from the Bureau of Markets 
CHARLES J. BRAND, Chief 
Washington, D. C. PROFESSIONAL PAPER 
MANUFACTURING TESTS OF | 
THE OFFICIAL COTTON STANDARDS 
: FOR GRADE | 
By 
WILLIAM S. DEAN, Assistant in Cotton Testing 
and FRED TAYLOR, Cotton Technologist 
CONTENTS 
Introduction Bleaching Tests of Yarn. . . 0 =~ 18. 
Origin of the Cotton Bleaching Tests of Piece Goods. . .. 21 
Spinning Tests at Cotton Mill Comparison of the Results of Spinning 
Spinning Tests at Textile School Bas Tests of the Old Permissive Cotton 
Weather, Relative Humidity and Moisture Grades with the Present Official Cotton 
Content During Spinning Tests . .. Standards 
Manufacturing Properties 
NOTE.—This bulletin should be of interest to cotton producers, 
manufacturers, and dealers 
WASHINGTON | 
GOVERNMENT PRINTING OFFICE 
ru 1917 
