33 
IBERIS AMARA. 
Temper- 
ature. | Time. | ature Time: ature. Time. 
oc. | °C, °C. 
5.7 14 days. 12.9 | 3.6 days. 20.4 | 2.75 days. 
9.2 | 6 days. 16.9 | 4 days. I y 
COLLOMIA COCCINEA. 
assess | 
5.35 | 17 days. 12.9 | 6.5 days 21.5 | 27 days. 
5.7 | 14 days. 16.9 | 5.5 days. | 
9.2 | 6.75 days. 19.6 | 15.5 days. | 
| _ | | 
LINUM USITATISSIMUM. 
1.8 | 34 days. 9.2 | 2-4 days. 21.1 | 36 hours. 
3.1 | 17 days. 12.9 || 2.75 days. 25.05 | 38 hours. 
4.8 Do. 13.5 || 1.75 days. 28.0 |-23-3 days. 
5.f | 6 days. 17.05 1 3 days. 34.0 | 8 days. 
MELON (CANTALOUPE). 
@echal Se ee == : : 
16.9 | 9.25 days. | 25.05 | 44 hours. 40.6 | 94 hours. 
19.4 | 68 hours. | 28.0 | 3.1 days. 
Be cie EH eel ee 
= NIGELLA SATIVA. 
j - : aid he amg || a Ve nee | 
5.7 | 2idays. | 12.9 | 9 days. || 21.1 | 4.25 days. 
9.2 | 15 days. 16.9 | 6 days | | 
aNd svi ts sap Be ees jews 
SESAMUM ORIENTALE. 
12.9/9days. || 25.05 | 21-22: hrs. 27.5 | 3lhours. | 
16.9 | 3 days. 24.6 | 22: hours. || 40.7 | 103 hours. 
21.1 | 33 hours. 28.0 | 22-26 hours. 51.5 | 25.7 hours. 
TRIFOLIUM REPENS. 
| | |. ; 
5.7 | 10 days. 13.0 | 69 hours. | 25.05 | 42 hours. 
9.2 | 5-6 days. 17.05 | 2.6 days. 28.0 | 72 hours. 
12.9 | 72 hours. 21.1 | 42 hours. | 34.0 | 8 days. 
ZEA MAYS. 
9.2 | 10-12 days. 21.1 | 42 hours. | 28.0 | 36 and 48 
12.9 | 5-7 days. 25.05 | 23-44 hours. | | hours. 
16.9 | 3.75 days | | 
| | 
De Candolle’s general conclusions are as follows: 
(1) Contrary to the opinions of early investigators, such as De 
Seynes (1863) and Edwards and Colin (1834), it is now proven that 
some seeds, and probably others, do germinate in water at the tempera- 
ture of 0° C. 
(2) There is a minimum temperature at which each species germi- 
nates. These temperatures are as follows: 
Sinapis alba germinates at 0° C., and possibly below this tempera- 
ture if the water can be kept liquid. 
2667—05 M——3 
