4 
Summary 
to ordinary storage conditions, but did not reduce germination of seed 
whose water content had been reduced to 8.3 per cent by storage under 
laboratory conditions. Antliracnose was greatly reduced by beating seed 
at 70° C. for 24 hours but was not completely eliminated by treatment 
at this temperature for 48 hours. 
7. A temperature of 60° C. applied to air dry cotton seed either 
directly or after a period of preliminary drying at a lower temperature 
did not kill all the antliracnose. 
8. Cotton seed which had been predried at temperatures of 40 to 
50° C. for 24 hours or more were subjected to a temperature of 70° C. 
for 72 hours without marked loss of viability, but this treatment did 
not free the seed from antliracnose. 
9. When infected cotton seed were predried at 40 to 45° C. for 
24 to 72 hours or at 50° C. for 12 to 24 hours and heated at 80° for 24 
to 72 hours, complete elimination of antliracnose was obtained in every 
test except one (5 out of 6) in which the heating was continued to 72 
hours, but was secured in none of the tests in which heating stopped at 
the end of 48 hours. Little or no reduction of germination occurred 
as a result of these treatments. 
10. When predried cotton seed were heated at 90° C., all antliracnose 
was killed in 24 hours in 7 out of 8 tests, in less than 24 hours in 7 out 
of 13 tests, and in 48 or 72 hours in the 3 remaining tests. No significant 
reduction in germination resulted from the treatment at 90° C. when 
the seed had been predried at 50° C. or above for 24 hours. 
i 
11. When predried cotton seed were heated at 100° C., complete 
control of antliracnose was secured in all except one (7 out of 8) test, 
and in this one instance the seed were heated for only 2 hours. Heating 
at 100° greatly reduced the germinability of the seed which had been 
predried at 50° C. or lower for 24 hours. Much better protection was 
obtained by predrying the seed at 60° C. for 24 hours. 
12. When predried seed were heated at 95° C., complete con¬ 
trol of antliracnose was secured in all of 14 tests in which the 
seed were heated longer than 8 hours, and in 4 out of the 6 remaining 
tests in which the seed were heated for 8 hours or less. Predrying the 
seed at 50° C. for 36 hours or at 60° for 18 to 24 hours conditioned the 
seed to endure the temperature of 95° C. without reduction in percentage 
of germination. 
13. A machine for treating cotton seed in bulk with dry heat is 
described and illustrated. This machine is dependable and partially 
automatic in operation and requires only occasional attention of the 
operator. The viability of the seed-borne elements of the antliracnose 
