340 Origin of Each Species Considered Separately. 



But let us return to the figures which seem to justify 

 these hopes. 



I shall first give the values for the chief families and 

 then those for their lateral branches. 



INDIVIDUALS OF OENOTHERA OBLONGA WHICH HAVE 



ARISEN BY MUTATION. 



I 



A. FROM 0. LAMARCKIANA. 



Main family . . . 1895 14,000 176 1.3 



... 1896 8,000 135 1.7 



A collateral family 1895 10,000 69 0.7 



Biennial culture . 1897 1,660 31 1.9 



Totals 4,350 35 0.8 



C. FROM O. NANELLA. 



O. nanella . . . 1897 760 1 0.1 



Although the /a/a- family of 1900 is considerably be- 

 low the average, the percentages in groups A and B con- 

 form pretty closely to a general proportion of about 1 % ; 

 whilst the figure for O. nanella affords a good example 

 of the rule that new species mutate less than 0. La- 

 marckiana or than 0/ lata fertilized with Lamarckiana 

 pollen. 



About the same proportion is maintained in crosses. 

 The following table embodies results already described, 

 together with some to be referred to later on. 



