31 



(l) TEMPERATURES OF ABOUT 20° TO 21° C. 



Lepidium gerniinated in 38 hours under 21.1° ; Linum gerniinated 

 in 36 hours under 21.1° ; Mays began to germinate in 42 hours under 

 21.1°; Nigella germinated in 4^ days under 21.1°; Sesamum germi- 

 nated in about 33 hours under 21.1° ; Sinapis germinated in 22 hours 

 on the average under 21.1°; some TrifoUum seeds germinated in 42 

 hours under 21.1°; Ihcrh germinated in 2^ days under 20.4°; only 

 one CoUomia seed germinated in 15^ days under 19.6° ; 2 Melon 

 seeds out of 10 germinated in 68 hours under 19.4°. 



(k) TEMPERATURES FROM 24° TO 25° C. 



Lhiuiii germinated in 38 hours under 25.05° ; Mays, 1 seed in 12 ger- 

 minated in 23 hours (half the seeds had germinated within 44 hours 

 under 25.05°) ; Melon, 2 seeds in 10 germinated in 44 hours, the others 

 subsequently'^ under 25.05° ; Sesamum germinated in from 21 to 22^ 

 hours under 25.05° (a second exj)eriment gave 22^ hours under 24.6°) ; 

 Sinapis germinated in about 36 hours under 25.05°; TrifoUum ger- 

 minated in 42 hours under 25.05° ; Nigella and Iheris observations 

 accidentally lost; Lepidium, 2 seeds in 10 germinated at the end of 

 the sixth day, and the majority of the seeds between the sixth and 

 seventh day under a mean temperature of 23.65°. A repetition gave 

 38 or 39 hours under a temperature of 21.1°; a third repetition gave 

 16 hours under a temperature of 26.5°, but which unfortunately ran 

 up to 43° during a few hours. De Candolle concludes that there was 

 some accident or mistake as to the first experiment, and therefore 

 rejects it ; jjrobably the w^rong seed was sown. He adopts for Lepid- 

 ium 38 hours under 21.1° C. Golloinia did not germinate until the 

 twenty-seventh day, when 2 seeds sprouted under an average tem- 

 perature of 21.5°. 



(l) TEMPERATURES OF ABOUT 28° C. 



Two Lepidium seeds germinated in 39 hours, but the greater part 

 not at all in 4 days ; Linum., 1 seed germinated at the end of 2| days, 3 

 seeds by the end of the third day, but the majority not at all ; Mays, 1 

 seed germinated in 36 hours, and the majority, with vigor, in 48 

 hours; Melon, 1 seed germinated at the end of the third day, and the 

 majority in 3J days; Sesamum germination began in 22 hours, and 

 began to be abundant in 25 or 26 hours (a repetition gave 1 seed 

 germinated in 31 hours under a temperature of 27.5° C.) ; Sinapis, 2 

 seeds out of 10 germinated at the end of the third day, a third seed 

 6 hours later, and the rest did not germinate; a few TrifoUum seeds 

 germinated at the end of the third day ; Collomia and Nir/ella did not 

 germinate in 8 days; a few Trifolimn and Linum seeds germinated 

 in 8 days under a temperature of 34°. 



