COMPARATIVE SPINNING TESTS. 11 
Referring again to page 6, it may be seen that the comparisons 
between the three grades of Arizona-Egyptian and Sakellaridis 
Egyptian show that the average differences in waste cotton were 6.80 
per cent, 6.38 per cent, and 7.07 per cent, respectively, in favor of 
the Arizona-Egyptian. In the comparisons of the two grades of Sea 
Island cotton with Arizona-Egyptian there were differences of 4.49 
per cent and 5.73 per cent, respectively, in favor of the Arizona- 
Egyptian. 
The tensile strength of the yarns made from the different cottons is 
affected by the percentage of waste discarded. Therefore, where the 
differences in waste are so evident, in order to make a more com- 
prehensive determination as to the comparative tensile strength, it 
would seem advisable to remove the same amount of waste from 
each kind of cotton. 
BLEACHING, DYEING, AND MERCERIZING. 
Investigations were made to ascertain the relative values of 
Arizona-Egyptian, Sea Island, and Sakellaridis cottons as to their 
bleaching, dyeing, and mercerizing qualities. These tests 1 were 
made upon both loose cotton and j^arns. The following numerical 
designations arbitrarily represent the different grades and kinds of 
cotton. For example, 1 to 4 represents Arizona-Egyptian, 5 to 6, 
Sea Island, and 7 to 9, Sakellaridis. 
Number. Grade. Kind. 
1 Extra Arizona-Egyptian. 
2 Choice Do. 
3 Standard Do. 
4 Medium Do. 
5 Fancy Sea Island. 
6 Extra choice Do. 
7 Good Sakellaridis Egyptian. 
8 Fully good fair Do. 
9 Fair. Do. 
BLEACHING LOOSE COTTON. 
The different methods used in bleaching will be referred to as 
methods (a), (b), (c), (d), (e), (f), (A), and (B). 
Method (a). — The cotton was bleached by treating it, without 
scouring, with a solution, obtained by the electrolysis of salt, con- 
taining 0.5 grams of chlorine per liter. In the future this solution 
will be designated as " electrolitic chlorine/' 
Method (b). — The cotton was scoured in a solution containing 1 
gram of soda ash in each 10 cubic centimeters; then bleached as in (a). 
Method (c). — The cotton was treated with 2 per cent acetic acid 
and bleached as in (a) . 
i These tests were made at the New Bedford Textile School in the laboratory of the department of 
chemistry, by Everett H. Hinckley, professor in charge of this department. 
