29 
The conclusions which De Candolle draws from his experiments are 
as follows: 
(A) AT A CONSTANT TEMPERATURE OF 0° Cc. 
From the 7th of March to the 11th of April—that is to say, in 35 
days’ exposure to this temperature—the following seeds did not ger- 
minate at all: Collomia, Lepidium, Linum, Zea mays, Melon, Nigella, 
Sesamum, Trifolium, Celosia. 
The only species which did germinate was Simapis, the various 
seeds of which germinated in from 11 to 17 days, the latter seemed 
to De Candolle to be the more proper value of the time. 
(B) AT TEMPERATURES FROM 1.4° TO 2.2° c. 
Collomia and Celosia did not germinate in 35 days; Lepidium and 
Linum germinated in 30 and 34 days, respectively, under average 
temperature of 1,8°. Zea mays and Nigella did not germinate in 35 
days; Sesamum did not germinate in 35 days; Sinapis germinated in 
16 days, at an average temperature of 1.9°. 
(c) AT TEMPERATURES VARYING BETWEEN 2.6° AND 3.2° c. 
Collomia did not germinate in 36 days; Lepidium, about one-half 
of the seeds germinated, on the twelfth, sixteenth, and thirty-first 
days, respectively; ZLinwm germinated on the seventeenth and 
eighteenth days, at an average temperature of 3.1°; Zea mays did not 
germinate in 36 days; Vigella did not germinate; Sesamum did not 
germinate. Three Sinapis seeds germinated on the ninth, one more 
on the seventeenth day. A new sowing of Sinapis gave one seed 
germinating on the sixth day. Afterwards the temperature was 
allowed to rise gradually, but the seeds which had not germinated 
before came to nothing. 
(D) AT TEMPERATURES FROM 4.2° To 6.1° c. 
About one-half the Collomia seeds germinated on the seventeenth 
day, at an average temperature of 5.35°;_Lepidiwm germinated abun- 
dantly on the eighteenth day; Zea mays did not germinate; about one- 
fifth of the Zinwm seeds germinated on the seventeenth day (average 
temperature 4.8°) ; Vigella, Sesamum, and Sinapis did not germinate. 
Possibly the moisture was too large in series (c) and (p). 
(f) AT TEMPERATURES BETWEEN 5.4° AND 6° ©. 
Some Collomia seeds germinated in 14 days; Lepidium germinated 
freely on the fifth day; Zinwm germinated freely on the sixth day; 
Zea mays did not germinate in 36 days; Vigella germinated in twenty- 
seventh day; Sesamum did not germinate in 36 days; Sinapis germi- 
