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. sciritillans, appeared very rarely. 



"(ENOTHERA LAMARCKIANA 



Elementary Species 



r"™ „ Aiuvi„ Obion- Rubri- Lamarck- Nan- t„. Scin- 



Gigas. Albida. ^^^^ ^^^.^j^ -^^^ ^^^^^ Lata. ^-^^^^^^ 



Generation. 



8 Gener 

 VIIL 1899 

 annual 







1, 700 21 



V 



7 Gener 

 VII. 1898 

 annual 



3,000 11 



V 



6 Gener 

 VI. 1897 

 annual 



11 29 



1, 800 9 



5 Gener 

 V. 1896 

 annual 



25 135 



20 



8,0 00 49 142 



— V 



6 



4 Gener 

 IV. 1895 

 annual 



15 176 



8 14,0 00 60 73 

 V 



3 Gener 



III. .1890-91 



biennial 



1 10,0 00 3 3 



V 



2 Gener 



11. 1888-89 



biennial 



15,0 00 5 5 



V 



1 Gener 



I. 1886-87 



biennial 



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 



