Mr Compton, On Right- and Left- Handedness in Barley. 501 



mode, which is at 60 7o- This percentage is the same as the 

 average given by the whole population of seedlings. There is no 

 sign (except possibly in the curve for r.ii. top leaves) of any 

 segregation, or of a separation into " pure lines." It would be 

 interesting to study other varieties of barley, not of pure lines, 



30 55 ^ 45 5D 3J 



Percentages 



m 90 tJ Too 



or which give different ratios of rights and lefts in the total 

 population, and to determine in what way the curves of percentages 

 differ from those given by the pure line " Plumage Corn." 



The results of this portion of the investigation are summarised 

 below in tabular form, which displays certain facts not exhibited 

 by the curves. (Table III.) 



III. Table III shows conclusively that the twist of the last 

 foliage leaf, immediately below a spike, has no effect whatever on 

 the ratio of left- to right-handed seedlings borne by that spike. 

 The correspondence between the two classes of spikes is indeed 

 extraordinarily close, and tends to confirm the accuracy of the 

 ratio 1'5 as expressing the proportion of lefts to rights in 

 " Plumage Corn." 



33—2 



