208 
Journal of Agricultural Research vo!. xxiii,no. 3 
Table III .—Bleaching with Javelle water and germination of Sudan grass and Johnson 
grass caryopses 1 
Sudan grass. 
Johnson grass No. 
37001. 
Johnson grass, San An¬ 
tonio. 1916. 
First evidence of bleach¬ 
ing. 
First coloring of Javelle 
water. 
First * ‘axis” completely 
- bleached. 
First embryo completely 
bleached. 
First seed completely 
bleached except clos¬ 
ing tissue. 
After 24 hours: 
Completely bleached 
Nearly all bleached. 
Little more than one- 
half bleached. 
About one-half 
bleached. 
Less than one-half 
bleached. 
Embryos bleached.. 
All but distal end 
bleached. 
All but closing tissue 
bleached. 
All but distal end 
and closing tissue 
bleached. 
Flat side bleached 
more than embryo. 
After 48 hours.. 
After 72 hours. 
After 96 hours. 
Germination: 
1 day. 
2 days. 
3 days. 
4 days 2 . 
Percentage viable. 
60 seconds, lighter 
over embryo. 
60 seconds.. 
45 minutes. 
75 minutes. 
3 hours, several 
in 6 hours. 
17 per cent. 
78 per cent. 
5 per cent. . 
o per cent. 
o per cent. 
100 per cent. 
o per cent. . . 
o per cent. 
o per cent. 
o per cent. 
Completely 
bleached ex¬ 
cept small spots 
on a few ca- 
ryops< 
Small spot on 
one caryopsis 
unbleached. 
All completely 
bleached. 
98 per cent. 
1 per cent. . 
15 minutes, light¬ 
er patches over 
embryo. 
30 minutes. 
45 minutes. 
120minutes.. . . 
None in 6 hours. 
5 per cent. . 
6 per cent. . 
68 per cent. 
19 per cent. 
2 per cent . . 
98 per cent. 
10 per cent. 
6 per cent. . 
58 per cent. 
o per cent. . 
All but 10 com¬ 
pletely bleached 
or nearly so . 
5 or 6 not com¬ 
pletely bleached 
at distal end. 
One not complete¬ 
ly bleached. 
65 per cent. 
3 per cent. . 
1 per cent. 
100. 
32 per cent. 
100. 
15 minutes less 
than in No. 
37001. 
60 minutes barely 
perceptible. 
120 minutes. 
None in 6 hours; 
some nearly so. 
None in 6 hours. 
1 per cent. 
2 per cent. 
8 per cent. 
10 per cent. 
79 per cent. 
26 per cent. 
8 per cent. 
o per cent. 
o per cent. 
24 per cent. 
Less advanced 
than No. 37001. 
Seven -only 
about one-half 
bleached. 
15 or 20 not 
completel y 
bleached. 
One not complete¬ 
ly bleached. 
44 per cent. 
19 per cent. 
36 per cent. 
99. 
1 100 seeds were used in each test, both for bleaching and germination. 
2 Cary ops es scratched at end of third day with a bent needle to induce germination. 
RESISTANCE OP COAT STRUCTURES TO THE ACTION OP CHROMIC ACID: CORRELATION 
WITH GERMINATION 
The resistance of the inner integument and the closing tissue in John¬ 
son grass caryopses to the action of chromic acid has already been 
referred to and might be inferred from the fact that these consist wholly 
or largely of suberin. 
