no 



BOTANICAL GAZETTE 



[FEBRUARY 



Summary of 

 0. 



TABLE XII 



TABLES n-XI, SHOWING THE FREQUENCY WITH WHICH 



pratincola gives rise to mut. nummularia 



In all, there were 19,766 seeds sown of the 7 strains which gave 

 rise to mut. nummularia. They gave 13,035 seedlings, of which 

 5,570 belonged to Fi and 7,465 to F^ progenies. The average 

 germination of the Fi seeds was 59 . 5 per cent, or 58 per cent if the 

 1000 seeds of Lexington C sown in the winter of 1912-1913 are not 

 figured in. Most of the Fi seeds were over a year old when they 

 were planted. The germination of the F^ seeds, which were sown 

 soon after they were harvested, was 71.8 percent. Inspection 

 of table XII shows the remarkable fact that the ratio of mut. 

 nummularia to seeds planted was nearly identical for the Fi and F2 

 progenies, 1:375 ^ the one case, 1:416 in the other, but that the 



