246 M.A. de Candolle on Germination 
first would certainly not have sprouted ; the second did not then 
appear to me disposed to germinate with sufficient uniformity to 
be worth trying. I have since found that it would have been 
better not to reject it. 
The first vessel contained the seeds of Collomia and Celosia. 
Its temperature varied but very slightly, from 1°-6 to 2° (mean 
1°8). The seeds did not germinate. The experiment lasted 
thirty-five days. Afterwards the temperature gradually rose to 
8°. This temperature of 1°8 to 8°, having lasted twenty-eight 
days, did not induce germination. 
The second vessel varied in temperature from 1°4 to 1°9 
(mean 1°65). It contained sowings of Lepidium and linseed. 
The former sprouted on the thirtieth day, in tolerable abundance, 
the latter on the thirty-fourth day*. 
The third vessel varied from 1°-5 to 2° (mean 1°°75). It con- 
tamed seeds of maize and Nigella. None germinated. After 
the experiment had lasted thirty-five days, the temperature being 
slowly raised during twenty-eight days as high as 8°, they still 
had not germinated. 
Lastly, the fourth vessel, containing the seeds of Sesamum 
and Stnapis, varied from 1°°6 to 2°2 (mean 1°9). The Sesamum 
did not germinate; neither did it germinate during the twenty- 
eight days of 1°-8 to 8°, subsequent to the experiment. The 
Sinapis, however, germinated on the sixteenth day. The mean 
of these sixteen days was 1°9, as that of the entire experiment. 
These facts, which are nearly all negative, help to confirm and 
explain the experiment at 0°. The germination of Sinapis on 
the sixteenth day, at 1°-9, shows that its true germination at 0° 
was rather the seventeenth day than the eleventh. 
At temperatures of 2°°6 to 3°°2. 
The three cylindrical and lateral cavities nearest the reservoir 
of ice contained the same species, sown, in three vessels, from 
the 6th of March. 
The cavity « contained seeds of Collomia and Lepidium. The 
temperature varied from 2°8 to 3°2 (mean 8°) during the 
thirty-six days which the experiment lasted. - The Collomia did 
not germinate. Some of the seeds of Lepidiwm germinated on 
the eleventh day}; they then perished; others, somewhat fewer 
in number, germinated on the sixteenth day; lastly, three ger- 
minated on the thirty-first day. Hence about half the seeds 
germinated, in succession. 
* In saying that a species germinated on the thirty-fourth day, I mean 
that thirty-four complete days were required for the radicle to show itself. 
+ I mean the end of the eleventh day. The same applies to all that 
follows. 
