248 Inhe7'itance in the Groundsel 



on the development of the ray florets. The NR plants, the original 

 F^ hybrids, as well as those appearing in F^ and ^3, have the rays so 

 feebly developed that each head must be examined under a lens. With 

 this help and when special attention is paid to very hairy examples, the 

 results need not be ambiguous. (See notes on the illustrations, p. 275 

 and PI. XV, figs. 25, 26, and 27.) There were seven beds altogether in 

 1910 and 1911 in which the segregation of the ray character could be 

 followed, and the result of their examination is given in 



Exp. Cross 



Exp. 23 Lanuginosus X praecox 



Exp. 24 Lanuginosus x praecox 



Exp. 25 Lanuginosus x erectus 



Exp. 26 Lanuginosus x erectus 



Exp. 27 Lanuginosus x multicaulis F-i 



Exp. 28 Lanuginosus x multicaulis F3 



Exp. 29 Lanuginosus x multicaulis f 3 



Totals ... 702 185 173 344 175 175 350 



The only noteworthy deviation from the normal ratio occurred in 

 the last bed, where the plants were uniformly hairy (homozygous for 

 hair) and where it might be suspected that some NR plants had been 

 counted as NN. It is just possible (not probable) that some of the 

 apparent NN plants were in this case really heterozygous for the ray 

 character. If R be taken as recessive in this case, we get the proportion 

 for this bed of Dominant : Recessive :: 77 : 20. 



The complete result of the analysis of the segregation of the ray 

 character is summarized in 



Totals ... 2502 681 602 1219 625 625 1250 



While these results prove that the radiate character is generally 

 transmissible, they also shew that the theory of dominance has to be 

 accepted with some reserve. The experimenter who analysed only the 



