26 BULLETIN 591, U. 8S. DEPARTMENT OF AGRICULTURE. 
conditions as well as in the weather and location of the mill and 
textile school explain the differences in the waste percentages shown 
in figure 10, which represent largely the differences in the moisture 
content of the cotton. If the waste percentages were corrected for 
moisture content, the results at the mill and textile school would be 
practically the same. The results of the moisture determinations 
emphasize the need of a more exact knowledge of the moisture con- 
tent of cotton in the various stages of handling and marketing it and 
of maintaining proper artificial atmospheric conditions while it is in 
the course of manufacture. 
Tensile-strength tests were made of yarn which had been spun 
with the use of several twist constants. It was found that the 
constant of 4.75 which is generally considered standard for upland 
PER SKSIN OF 120 YARDS. 
. 
A 
A 
E 
: 
: 
E 
Fig. 11.—The average tensile strength of 22’s yarn in pounds per skein of 120 yards each, as found in the 
mill and textile school tests. (4.75 twist constant used.) 
cottons was excessive. Figure 11 represents graphically the average 
tensile strength of 22’s yarn in pounds per skein of 120 yards pro- 
duced in the mill and the textile school for each of the five grades 
tested. 
The bleaching tests were conducted in bleacheries in Massachusetts, 
and the results checked in a textile school in the North. The results 
showed that when the goods made from each grade were bleached 
under identical conditions Middling Fair and Good Middling were 
practically identical in color. The goods made from Middling 
did not produce quite as pure a white as Middling Fair and Good 
Middlng, but for commercial purposes gave satisfactory results; 
the goods made from Low Middling gave a slightly slaty color 
when closely compared with the other grades, while the goods made 
from Good Ordinary were easily distinguished by a slaty, bluish 
