112 



Ex2)eriments with Primula sinensis 



or only faintly coloured stems. The magenta and red classes form 

 parallel series of light and intense shades ; the two classes as a whole 

 are readily distinguished, though there usually occurs a small number 

 of individuals whose proper position may be a matter of some doubt. 

 Ill this connexion it may be remarked that the presence of the red 

 stigma seems to have the effect of giving the flower in general a redder 

 appearance than that of the corresponding type with green stigma. 



Two F„ families raised from this cross in 1907 show some departure 

 from the normal in the ratio of full colours and "Sirdars"; the 

 numbers obtained were : 



113 29 55 20 



* The distinction between these two classes is not sharp. 



67 



The case does not perhaps merit any great consideration in view of 

 the return to the normal ratio when the experiment was repeated in 

 the succeeding years, and the lack of any other indications of a depar- 

 ture from the normal distribution of self-colours and " Sirdars." 



Three families raised subsequently gave : 



Full colours ■"Siritars" 



Pale class 



15 



35t 



20 



41 



* Distinction not sharply drawn. 



t Of 6 of these which had some colour in the stem, 4 had coloured stigmas, 2 green. 



The five families taken together give 245 magentas, 82 reds ; 234 

 green stigma, 93 red stigma; the calculated numbers in each case being 

 245-25 of the larger class, 81-75 of the smaller. In the first two 



