33 



IBERIS AMARA. 



COLLOMIA COCCINEA. 



5.:i5 ir days. 

 5. 7 14 days. 

 9.3 I 6. 75 days. 



12.9 6.5 days. 

 16. 9 5.5 days. 

 19. 6 15. 5 days. 



27 days. 



LESrUM USITATISSIMUM. 



NIGELLA SATIVA. 



De Canclolle'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 : 



Sitiapis alba germinates at 0° C, and possibly below this tempera- 

 ture if the water can be kept liquid. 

 2667—05 M 3 



