THE PURE LINE HYPOTHESIS. 



557 



raised by selling- an individual with an intensity of colouration of, 

 say, 13 per cent, (such as IV.) should not appreciably differ from 

 the family resulting from an individual with a colour intensity 

 of, say, 63 per cent, (such as III.). 



Each of the 21 hybrids was self-fertilised, and families were 

 duly raised. The results obtained with reference to the red 

 colouration are given in the accompanying table in descending 

 order of the mean colour intensity of the red members of the 

 families : 



