G. P. HECTOR 



91 



on this basis being 11,885-1 to 9,243-9. Two to three hundred seedlings from 

 each of forty-five of these seed-beds were transplanted at random in the field 

 and in the same year subsequent counts of the mature plants gave 6,265 

 reds : 4,846 green, the expectation being 6,249-94 : 4,861-06, a still closer 

 approximation to the 9 : 7 ratio. 



In the years 1913 and 1914 detailed counts were also made in the field 

 of 10 plots raised from similarly coloured natural crosses selected for their 

 colour characters in 1912 and 1913, and the results are tabulated below : 



Table I. 



Adopting the notation employed by Bateson, Saunders and others, if 

 R be considered the factor which in presence of a chromogen base C produces 

 the red colour, then the simplest explanation of these cases is to suppose that 

 the coloured parent was of the coiistitution CR and the green (colourless) 

 cr. The Fi hybrid will then have the constitution RrCc, and on selfing will 

 give rise to plants of the following constitutions : — 



9RC— red, 



3Rc — green, 



3Cr— green. 



Icr — green, 



Le. 9 red : 7 green. 



