330 



Bulletin 312 



per cent, increasing from 90.5 per cent for the 15-minute treatment, 

 through 94.5 per cent and 95 per cent for the 30-minute and 45-minute 

 treatments respectively, to 98 per cent for the 60-minute treatment, and 

 falHng to 90 per cent and 87.5 per cent for the 120-minute and 180- 

 minute treatments respectively. It is not believed, however, that the 

 graduated increase and decrease in germination is of much significance. 

 It is seen in Table 18 that lot C 10 gave in the check tests 90 per cent 

 and 95.5 per cent germination, the samples that were soaked in water 



Fig. 83. — The solid line represents the germhiation of cotton seed treated with concen- 

 trated sulfuric acid for jo to 180 minutes; the broken line, the germination of the 

 untreated seed. ( Tables ly and ig) 



for 24 hours previous to being placed in the germinator giving the lower 

 germination. The acid-treated samples vary from 93.5 per cent to 99 

 per cent germination, the highest germination in this case being for the 

 120-minute treatment and the lowest for the 60-minute treatment. 

 Germinations of 96 per cent, 95. 5 per cent, 95 per cent, and 94. 5 per cent, 

 were secured for the 180-, 30-, 45-, and 15-minute treatments, respectively. 

 In the tests with these lots the total germination of the acid-treated 

 seed was about the same as that of the checks. The germination was 

 markedly accelerated, however, by the acid treatment. The acceleration 

 is represented graphically in Figs, 83 and 84, where the average germina- 



