258 Inheritance in the Groundsel 



while others are either (2) more, 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 F„ generations of the 

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



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

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

 thus : — 



Types 



hh 



118 



41 



159 

 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 



