250 M.A. de Candolle on Germination 
Sinapis. Germinated in about forty hours. The mean, with 
the preceding experiment, is forty-one hours, at 12°9. 
Trifolium. In three days, minus about three hours, at 13°-0. 
At a temperature of about 17°: 
Some sowings were placed, on the 15th of May, in a room 
where the temperature of the air varied 1°3 to the end of the 
month, and that of the sand in which the seeds were placed, also, 
1°3. During the first three days, the mean to which the seeds 
were subjected was 17°°2; the Lepidium and Sinapis germinated 
towards the end of one anda half to one and three-quarters day; the 
linseed and Trifolium at the end of the second day. Considering 
the rapidity of the phenomenon, I wished to repeat the experiment 
with still more exactness, and I found that, the means being 16°°9, 
Lepidium germinated in thirty-six hours. 
Linseed sprung up partially at the end of the fourth day. 
Sinapis at the end of three days and a half. 
Trifolium at the end of about three days and a quarter. 
Under a mean temperature of 17°-3, in a third experiment, the 
Stnapis germinated at the end of the second day. The mean of 
these three results, in the case of Sinapis, is one day and seven- 
tenths [? 2°33 days], at 17°:2. 
The mean of two experiments gives for the other species, at 
17°-05 :— 
Lepidium. One day and a half. 
Linum. Three days. 
Trifolium. Two days and six-tenths. 
The other species gave, at 16°-9 :— 
Collomia. Five days and a half. 
Maize. Three days and three-quarters. 
Melon. Commenced at the end of nine days and a quarter, and 
continued to spring up on the subsequent days. 
Nigella. The sixth day. 
Sesamum. The third day. 
Iberis. The fourth day. 
At a temperature of about 20° to 21°. 
Similar sowings were made in a room in which the tempera- 
ture was tolerably constant. The seeds, placed in an open box, 
were copiously watered, covered with moistened brown paper, and 
the whole shut in a drawer. The shape of the box allowed the 
thermometer to be placed obliquely in the superficial layer of 
sand in which the seeds were placed. At 4 p.m. on the 2nd of 
August, when the experiment was begun, the temperature was 
