IIo BOTANICAL GAZETTE [FEBRUARY 
TABLE XII 
SUMMARY OF TABLES II—XI, SHOWING THE FREQUENCY WITH WHICH 
O. pratincola GIVES RISE TO MUT. nummularia 
Numb — of | Ratio of 
m num- 
Strain | Generation pees cs gird “peat of mut. imaioria to or 
nummularia Bran total plants 
Lex Ae. F, 1083 ace 22.8 4 ra7t 1:64 
co ee F, 719 436 60.6 3 1:240 1:145 
Lex. A ..| FL & F, 1,802 691 38.4 7 12257 1:99 
BexoB F; 920 508 $5.2 ° 
neat F, 1776 1245 70.1 4 17444 22995 
bee B.A Fre Ti 2,696 1,753 65.0 Piles tee aie? 1:438 
Lex. C :. F,; gaa 2923 69.3 II 1:384 1: 266 
eles F, 7902 5784 73.2 18 1:430 1:321 
Lex. C...| Fe & F, | 12,123 8,707 71.8 29 1:418 1:300 
bax. F, 231 102 44.2 I 33933 1:102 
Lex. G F, 1,821 1,284 70.5 4 1:455 igi 
Lex. H F, 458 230 50.2 2 1:226 T:1I5 
fs a Wakes F, 635 268 42.2 3 15212 1:89 
All...... F, 9,369 5,570 59-5 25 1:375 | 1:223 
ho F, 10,397 7,405 71.8 eed 1:416 eee 
ee F,& F, | 19,766 | 13,035 66.0 50 13305 1: 261 
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 F, and 7,465 to F, progenies. The average 
germination of the F, seeds was 59.5 per cent, or 58 per cent if the 
tooo seeds of Lexington C sown in the winter of 1912-1913 are not 
figured in. Most of the F: 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 F; and F. 
progenies, 1:375 in the one case, 1:416 in the other, but that the 
