258 Inheritance in the Groundsel 



while others are either (2) wore, or (3) less hairy. Arranging the plants 

 in three groups accordingly, and commencing our analysis with the F^ 

 generations of three RR plants (probably the result of an accidental 

 cross of lanuginosus by erectus, radiatus (see p. 247)), we get the following 

 result : 



TABLE VIII. 



Segregation apparently takes place normally in each of these three 

 cases. 



If we now examine in the same way the F2 generations of the 

 three NR types of known parentage, we get the result shewn in 



Exp. Cross 



Exp. 23 Lanuginosus x praecox 



Exp. 25 Lanuginosus x erectus 



Exp. 27 Lanuginosus x multicaulis 



The result of Exp. 27 is clearly aberrant. Deferring its con- 

 sideration, we may summarize the results in the other five experiments, 

 thus : — 



Types 



« Exp. No. of plants HH Hh hh 



Nos. 56, 57 and 58 434 108 208 118 



Nos. 23 and 25 172 41 90 41 



^ , J ( Found 606 149 298 159 



^^^ \ Expected 606 151 303 151 



No thoroughly satisfactory explanation can be given of the result 

 in Exp. 27. Not only are the numbers very aberrant, but the mode 

 of obtaining them is liable to criticism. All the HH plants were 

 certainly more hairy than the original F^ heterozygote. There were 

 certainly 61 HH plants present. But all the other plants had some 

 hair, and at the first examination only 20 were marked as hh. Ex- 

 tracting these and re-examining the remainder, this was found to 



