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. 



"(ENOTHERA LAMARCKIANA 



Elementary Species 



GENERATION. 



8 Gener ) 

 VIII. 1899 



annual ) 



7 Gener ) 

 VII. 1898 



annual ) 



6 Gener ) 

 VI. 1897 



annual ) 



5 Gener 

 V. 1896 

 annual 



4 Gener ) 

 IV. 1895 



annual ) 



3 Gener ) 

 III. 1890-91 



biennial ) 



2 Gener ) 

 II. 1888-89 

 biennial ) 



1 Gener ) 

 I. 1886-87 

 biennial ) 



AIK^IO Oblon- Ruhri- Lamarck- Nan- T Scin- 



Gigas. Albida. gata nerv|s jana _ Lata. 



25 135 



15 176 



20 



8,000 49 1 12 



6 



8 14,000 60 73 1 



1 10,000 3 3 



15,000 5 5 



V 



9 



"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 



