No. 585] SHORTER ARTICLES A XT) DISCUSSION 



r,S3 



The data follow. 



(Deration of Florida by Yokoham 



5eeds sown early in May 



s are approximately fortnights) 



The average of the semi-sterile is about a fortnight later than 

 that of the fertile. If we divide the plants into those flowering 

 before and after August 11, we have: 



A calculation, based on the hypothesis used for semi-sterility 

 (1), shows that the crossing-over (3) between K and 77 is prob- 

 ably less than 17 per cent. 



Seeds sown early in June 



le; though the 

 late planting 



Seron.l < Viioratinn of Florida l.y Ynk< 



