576 WHITE— STUDIES OF INHERITANCE IN PISUM. 



Mm. frequency classes 12 13 14 15 16 17 18 19 20 21 



No. of plants 5 14 9 17 22 9 2 



In the Fo of a reciprocal of this same cross, 42 wide and inter- 

 mediate and 13 narrow were obtained. A correlation between nar- 

 row pods, small seed and leaves and wide pods, large seeds and 

 large leaves is noted. 



In still another cross of the 13 mm. variety X French Sugar 

 (over 20 mm.), the F^ pods were intermediate. Of 84 F„ plants, 19 

 were classified as narrow-podded and 65 as wide-podded. 



In F3, seeds of the various F, types gave 



9 Fo narrow pod produced only narrow (13-16 mm.), 

 4 F2 narrow pod produced very narrow and narrow pods, 

 9 Fo wide pod produced only wide (17 mm. and over), 

 22 Fo wide pod gave both narrow and wide pods. 



In this cross, as in the others, wide pods in the main were asso- 

 ciated with large seeds and narrow with small seeds. 



I NTERPRET ATIO N , 



Lock (54) interprets his data as showing segregation in Fo, but 

 until a much greater mass of data is obtainable, it is useless to 

 speculate on the factorial nature of this character. In some cases 

 one should expect a simple one factor difiference, while in other 

 cases the results are probably very complex. 



21. Maturity of Green Pods for Market. 



This character is complex and closely associated with the time 

 of blooming, etc. Hurst found a variation of 52 days among the 

 112 varieties he grew under similar environmental conditions. 

 Tedin {yj^ crossed varieties of peas breeding true to the same 

 ripening period and secured forms with decidedly longer and shorter 

 time of maturity periods. 



Sterility. 



Sterility in peas is almost unknown even in crosses between such 

 so-called species as P. arvense, P. Jomardi, P. clatitis, P. sativum. 

 The only recorded cases of sterility in this group are between a form 



