158 



EVOLUTION AND ANIMAL LIFE 



from these plants. The seeds were selected in each case from self- 

 fertilized plants of the lamarckiana form, so that the new plants ap- 

 pearing in each horizontal line are the descendants in each generation 

 of lamarckiana parents. It will be observed that the species, 0. ob- 

 longata, appeared again and again in considerable numbers, and the 

 same is true for several of the other forms also. Only the two species, 

 0. gigas and 0. scintillans, appeared very rarely. 



"CENOTHERA LAMARCKIANA 



Elementary Species 



GENERATION. 



n,io- n \lhirla vuiufi- Rubri- Lamarck- Nan- T , Scin- 

 Gigas. Albida. gata nervis . iana . nella . Lata. ti])ans 



"Thus de Vries had, in his seven generations, about fifty thousand 

 plants, and about eight hundred of these were mutations. When the 

 flowers of the new forms were artificially fertilized with pollen from 



