Relation to the Germination of Immature Seed. 
441 
Table III. 
Germination of White Mustard Seeds at different stages of maturity. 
All the seeds were sown on moist sand in a thermostat at 20° C. 
Kind of Seed sown 
( sown on Sept. 1 1). 
Number 
of Seeds 
sown. 
1 
day. 
Germinations after : 
3 5 8 
days. days. days. 
V 
days. 
Yellow -ripe, testas off, dried in the 
laboratory air for 2 days 
10 
8 
10 
— — 
: 
Green-ripe, testas off, dried in the 
laboratory air for 2 days 
10 
0 
1 
2 2 
2* 
Green-ripe, testas on, dried in the 
laboratory air for 2 days 
10 
0 
0 
0 0 
O* 
* The ungerminated seeds were dead. 
Table IV. 
Germination of White Mustard Seeds at different stages of maturity. 
Lot A 
.. B 
Lot A consisted of ten green -ripe seeds. 
Lot B consisted of ten bare embryos from similar seeds. 
Sown on moist sand, July 14. 
Number of Germinations after : 
2 days. 4 days. 6 days. 7 days. 1 2 days. 
o o 
o o 
001 
5 IO + — 
* The 8 ungerminated seeds finally died. 
f Healthy plants. 
18 days. 
2* 
Chart. Germination of White Mustard seeds at different stages of maturity as affected 
by the seed-coat and by drying the seed (see Table II). 
From the above experiments on the germination of immature White 
Mustard seeds it appears that the presence of the testa is fatal so long as 
the seeds are still green and have not reached their full dry weight. If they 
are sown without the testa they germinate in a healthy manner, but if 
sown with the testa on they perish. As the seed ripens, however, and 
