No. 624] INHERITANCE OF HULL-LESSNESS 17 



of factors. An analysis of the different heterozygous or 

 intermediate individuals of these second generation 

 plants showed that for these hybrids also there was a 

 great amount of variation in the percentage of hulled or 

 hull-less kernels in the individual plants, the variation 

 ranging all the way from less than 5 per cent, to 95 per 

 cent, or more. In Figs. 4 and 5 are shown two forms of 

 heterozygous plants, one very low and one very liiiili, in 

 percentage of hulled kernels. Those pctvciitauvs were 

 obtained from the heterozj-gous individuals liy soiling- 

 the kernels from one head of each plant into hulled and 

 hull-less as outlined earlier. The percentage of hulled 

 kernels on the heterozygous plants of the second genera- 

 tion for the three series is given in Table I. 



TABLE I 







Hulled Kernels ok the Heterozygous Plants 

 AND Hull-less Oats. 



379 

 202 



Hulless X Avena 

 Hulless X Swed- I 

 Hulless X Sixty j 



2 3 5 

 4 4 3 



ii: 





§ ^ i ^ i i 



From this table it is seen that there is considerable dif- 

 ference in the percentage of hulled kernels on the dif- 

 ferent heterozygous plant. The range is from a very 

 low percentage or one which indicates nearly all hull-less 

 to a very high percentage or one which is nearly all 

 hulled. There is no general grouping near the middle of 

 the series, as might be expected with the exception of 

 series 382. This may be due to lack of numbers or to a 

 segregation of the different types which give percentages 

 ranging from low to high without any tendency to group- 

 ing. That it is not due to lack of numbers is probably 



