MANUFACTURING TESTS OF COTTON. 
A few samples of fumigated and nonfumigated Peruvian and 
Chinese cottons were secured from the mills and chemical laboratory 
tests were made on these cottons in the department of chemistry and 
dyeing of the New Bedford Textile School. 
METHODS OF COMPARISON. 
Each bale was given a mark so that it could not readily be identi- 
fied while in the manufacturing processes as to whether it had been 
fumigated. The fumigated and nonfumigated cottons of each lot 
were opened and left standing overnight. They were run through 
the machines under the same conditions of speeds and settings, and 
where possible the fumigated and nonfumigated portions of each lot 
were placed side by side on the same machine, advancing together 
through the various processes of manufacture. Between each run the 
machines were cleaned thoroughly. Total weights were taken before 
and after the cotton was fed into the opener, finisher, cards, and 
combers respectively. Records of humidity were taken hourly and 
the humidifiers regulated accordingly, keeping the relative humidity 
as nearly uniform as possible for the respective lots. 
WASTE PERCENTAGES. 
Table I gives the comparative waste percentages of the fumigated 
and nonfumigated cotton. 
Lots No. 1 and No. 2 represent respectively the lj-inch staple and 
the l^-inch staple, fumigated and nonfumigated cotton given sepa- 
rately, which were tested at the New Bedford Textile School, New 
Bedford, Mass. Lots No. 3 and No. 4 represent a digest of the 
reports received from the two manufacturing firms. 
Table I. — Waste percentages. 
[Based on net weight of cotton fed into each machine.] 
Lot No. 1. 
Lot ^o. 2. 
Lot No. 3. 
Lot No. 4. 
Kind of waste. 
Fumi- 
gated. 
Non- 
fumi- - 
gated. 
Fumi- 
gated. 
Non- 
fumi- 
gated. 
Fumi- 
gated. 
Non- 
fumi- 
gated. 
Fumi- 
gated. 
Non- 
fumi- 
gated. 
Opener: 
Visible- 
0.67 
1.06 
0.25 
1.50 
0.46 
.87 
0.33 
.67 
1.45 
1.47 
Total visible 
1.73 
2.53 
1.75 
1.75 
1.33 
.29 
1.00 
.62 
0.65 
.83 
.53 
.55 
1.45 
.05 
1.47 
.03 
Total visible and invisible.. 
4.26 
3.50 1.62 1.62 
1.48 
1.08 
1.50 
1.50 
Finisher: 
Visible — 
Dust room 
.14 
1.43 
.14 
.96 
.09 
.74 
.09 
.65 
.47 
.48 
Total visible 
1.57 
1.14 
1.10 
.13 
.83 . 74 
.78 
1.15 
.63 
.61 
.47 j .48 
Invisible 
.18 
.04 
.03 .03 
Total visible and invisible. . 
1.43 
1.23" 1.01 .78 
1.93 
1.24 .50 | .51 
1 Invisible gain, not loss, as a result of weather conditions. 
