Oenothera Nanella. 367 



the recording was usually done at an earlier age. For 

 it is obvious that the earlier this can be done the greater 

 is the number of individuals that can be dealt with. 



When the seeds are sown in beds and not in boxes, 

 as they usually were at first, we must of course await 

 either the full development of the rosette or if they be- 

 come annuals, the production of a stem. 



The characters described have enabled me to obtain 

 the figures already given, as to the repeated appearance 

 of O. nanella from O. Lamar ckiana and from other new 

 species. I propose to give these figures again together 

 with results obtained in certain other cultures in order to 

 convey some idea of the frequency of nan^/Za-mutations. 



The fact that they appear every year, and in numbers 

 which become greater in proportion as the sowings are 

 more extensive is proved by the tables given in §§ 2-7; 

 so that I shall have no occasion to refer to it again. 



INDIVIDUALS OF O. NANELLA V/HICH HAVE ARISEN BY 



MUTATION. 



I. FROM OENOTHERA LAMARCKIANA. 



THE ORIGIN OF THE 



YEAR 

 LAMARCKIANAS: 



Lainarckiana-idcrmiy . 1889-1899 

 A branch of the same . 1895 

 Laemfolia-tamily . . 1889 

 Various crosses (p. 300) 1898 

 O. scintillans .... 1897-1898 

 A biennial culture , . 1897 

 Culture of plants with 

 variegated leaves . . 1899 



Totals 70,154 340 0.5 



The proportion of dwarfs produced by Lamarckiana 

 is — if we neglect the laevifolia-ia.mi\y where it is possible 

 that other factors may have come into play — a fairly 



