12 
BULLETIN 1056, IT. S. DEPAKTMENT OE AGRIct TLT TJKE 
ily. This makes recleaning and grading difficult, and probably ac- 
counts for a number of unsuccessful attempts to operate various 
machines now on the market. If properly delinted, however, as de- 
scribed on page 9, the surplus lint is removed, leaving the seed in 
such a condition that recleaning and grading is greatly facilitated. 
The low average yield per acre is the greatest factor affecting the 
profitableness of the cotton-growing industry. Any practice result- 
ing in an increased yield with only slight additional cost tends to 
lower the net cost of production per pound, ^n experiments con- 
ducted by the Bureau of Plant Industry, 9 graded seed produced 
FIG. 
-Cottonseed : a, Ginned ; b, closely delinted, showing black hull of seeds. 
Natural size 
from 88% pounds, or 8.25 per cent, to 103 pounds, or 10.9 per cent, 
more seed cotton per acre than ungraded seed. In preparing the 
seeds used in these experiments for grading it was necessary to roll 
them in some finely pulverized material sprinkled with water to 
paste down the surplus lint or fuzz so that they would separate read- 
ily. The addition of water and any foreign material, however, in- 
troduces a possibility of error in the grading, because in some cases 
it changes the relative weight of the individual seeds. The mechani- 
cal process of removing the surplus lint or fuzz with delinting ma- 
9 Webber. Herbert J., and Boykix, E. B. the advantage of planting heavy cotton- 
seed. U. S. Dept. Agr. Farmers' Bulletin 285. 1907. 
