The Mode of Inheritauee of Semi-Sterility iu the Offspring of Certain Hybrid Plants. 319 



The first plant had only 3 pods, and the sei^ond plant only 1 pod, -with 

 no aborted ovules. Tliis is only 1 per cent of full pods. In the second 

 plant the aborted ovules were reckoned for the distal halves of the 

 pods. There were 41 per cent of the ovules aborted in the first three 

 seed-places. 



The abortion of nearly half the ovules in the ripe pods does not 

 entail a quite corresponding decrease in the number of good seeds, as 

 is shown by the following table. By "good" seeds is meant those seeds 

 which appeared viable. 



Fig. 11. Selected pod of tlie first generation of the Velvet by Yokohama cross. 

 Natural size. 



Pedigree No. 



V-174-!) 

 V-174-17 



Pods 



30,5 

 103 



Good Seeds 



1.344 



418 



Average number of good 

 seeds to one pod 



4'4 Average of Velvet 



4-1 4-2 



Y9 

 Y5 

 Y6 



49 

 27 

 40 



181 

 113 

 186 



3-7 

 4-2 



4-7 



Average of Yokohama 

 4-1 



Average of Hybrid 

 35 



(The Yokohamas were grown in 1911, the other plants in 1912.) 



