6 BULLETIN 366, U. S. DEPARTMENT OF AGRICULTURE. 
lated accordingly in order to maintain as nearly as possible a con- 
stant relative humidity of 65 per cent. 
Table IV gives the results of the tensile-strength tests. 
Lots Nos. 1 and 2, respectively, represent the two lots of lj-inch 
and lj-inch Egyptian cotton manufactured at the textile school, 
while Nos. 3, 4, 5, 6, and 7 represent five lots of cotton, each manu- 
factured by a different representative manufacturing company. The 
small variations in the various numbers of yarn were standardized 
for comparison. The differences in tensile strength, in some in- 
stances, were in favor of the fumigated and, in some instances, in 
favor of the nonfumigated cotton. 
Table IV. — Tensile strength comparisons. 
(Made in Yarn Testing Laboratory of the United States Department of Agriculture.) 
Lot Xo. 1. 
Lot No. 2. 
Lot No. 3. 
Lot No. 4. 
Lot No. 5. 
Lot No. 6. 
Lot No. 7. 
Breaking 
Breaking 
Breaking 
Breaking 
Breaking 
Breaking 
Breaking 
strength in 
strength in 
strength in 
strength in 
strength in 
strength in 
strength in 
poimds per 
pounds per 
poimds per 
poimds per 
pounds per 
pounds per 
pounds per 
/ 
skein of 120 
skein of 120 
skein of 120 
skein of 120 
skein of 120 
skein of 120 
skein of 120 
Number of 
yards. 
yards. 
yards. 
yards. 
yards. 
yards.. 
yards. 
yarn. 
•6 
•d 
TJ 
"d 
>d 
T3 
<D 
4* 
<o 
CD 
to 
C3 
i 
a 
S 
3, 
9 
so 
1 
"a 
1 
OS 
a 
1 
"8 
1 
a 
i 
1 
t 
a 
a 
1 
a 
c3 
bo 
a 
"S 
"8 
03 
fcJO 
1 
a 
1 
3 
"3 
3 

3 

S 

=3 

3 
O 
3 

3 

5 
b 
ft 
Z 
^ 
£ 
Z 
Ph 
Z 
ft 
fe 
15's . 
302. 11 
303.9 
20's 
108. 4S 102. 70 
22's 
102. 30 
106. 45 
115. 38 115. 48 
40's 
39.98 
27.28 
37. 56 
27.35 
50's 
55's 
27.51 
28.20 
75's 
24.88 
26.05 
80's 
26.45 
28.05 
84's. 
8.32 
7.66 
Table V. — Tensile strength comparisons. 
[Made by two representative cotton mills.] 
Number of yarn. 
Lot No. 3— Break- 
ing strength in 
pounds per skein 
of 120 yards. 
Lot No. 4— Break- 
ing strength in 
poimds per skein 
of 120 yards. 
Fumi- 
gated. 
Nonfu- 
migated. 
Fumi- 
gated. 
Nonfu- 
migated. 
27s 
114.8 
112. 8 
30. 25 
30.60 
It will be observed that in lot Xo. 3 the fumigated cotton produced 
the stronger yarn; in lot No. 4 the reverse was true. 
SINGLE-THREAD TEST. 
In addition to the tests shown in Table IV several tests were made 
with a single-thread testing machine. 1 The results of these tests are 
1 These strength tests were made by William Smith, professor in charge of the carding 
and spinning department of the New Bedford Textile School, New Bedford, Mass. 
