4 BULLETIN &i6, U. S. DEPARTMENT OF AGRICULTURE. 
The greater part of this difference in waste occurred at the pickers 
and cards, and may be partly accounted for by the lower grade of 
the Meade selected for the test. 
On averaging the results of the tests for the three seasons, it was 
found that on the pickers, the Meade cotton was 0.82 per cent more 
wasty than the Sea Island ; on the cards, 1.40 per cent ; on the combers, 
1.94 per cent; and for all three processes, 3.50 per cent. The differ- 
ence on the comber could be eliminated by slight adjustments of this 
machine, so that the difference in the wastiness of the two cottons 
might be reduced to an almost negligible amount. 
BREAKING STRENGTH OF YARN. 
Both growths of cotton were spun into 23's, 40*s, 60's, 80's, and 
100's yarn. Each number of yarn was produced with three different 
twists, namely those indicated by the twist multipliers 3.25, 3.50, 
and 3.80. That is, these figures multiplied by the square root of the 
number of yarn being spun give the turns of twist per inch in the 
yarns. The results of the twist tests were not conclusive in that the} T 
show some cases in which the strength of the yarn increased on 
changing the twist multiplier from 3.5 to 3.8. and other cases in 
which the strength decreased with the greater twist. The same facts 
were evident when the twist multiplier was changed from 3.5 to 3.25. 
A comparison of the breaking strengths of the Meade and Sea 
Island cottons is shown in Table 2, in which the breaking strength 
in pounds per skein of 120 yards for the various numbers of yarn 
having a twist equal to 3.5 times the square root of the number of 
yarn is given. 
Table 2. — Breaking strength, in pounds, per skein of 120 yards of various sizes 
of yarns spun ft-om Meade and Sea Island cotton grown in different seasons. 
(3.50 twist multiplier used.) 
Season. 
Size of 
yam. 
Meade cotton. 
Sea 
Island 
cotton. 
1916-17 
J23's 
\100's 
[23's 
10's 
•tfO's 
sirs 
UOO's 
(23's 
40's 
-teO's 
SO's 
[lOO's 
129.7 
15.2 
1.09.2 
60.1 
35.4 
ay soil. 
107.69 
53.5 
3C.7 
19.6 
12. S 
144.7 
191S-19 .. 
17:4 
128.7 
69.8 
39.4 
24 
it 
Sa7idu soil. 
103.8 
54.6 
33.7 
22.6 
15.5 
.1 
.3 
CI 
25.9 
17.6 
122. 6 
34.8 
2-2.3 
15.6 
During the seasons of 1916-17 and 1918-19, when the Meade and 
Sea Island cottons were grown under normal conditions, the break- 
ing strength of the yarns spun from Meade cotton was weaker than 
