330 



BULLETIN 312 



per cent, increasing from 90.5 per cent for the i5-minute treatment, 

 through 94.5 per cent and 95 per cent for the 3o-minute and 4 5 -minute 

 treatments respectively, to 98 per cent for the 6o-minute treatment, and 

 falling to 90 per cent and 87.5 per cent for the i2o-minute and i So- 

 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 germination of cotton seed treated with concen- 

 trated sulfuric acid for 30 to 180 minutes; the broken line, the germination of the 

 untreated seed. ( Tables 17 and IQ) 



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 

 i2o-minute treatment and the lowest for the 6o-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 is-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- 



