484 
Selective Elimination in Staphylea 
The percentage of total locules with "odd" numbers of ovules in the three 
series is : 
Percentage "odd" in Lot A = 37-407 + -412, 
Percentage " odd " in Lot B = 36-065 ± -377, 
Percentage "odd" in Lot C = 25-185 + "326. 
The probable errors for these frequencies were calculated froni the formula 
%. = -G7449y^2/,x(l-|), 
where yg is the frequency in any one of the four classes, and m is the total 
population. From the probable error for the absolute frequencies so obtained the 
probable errors for the percentage frequencies were got by taking the ratio 
Comparing the series among themselves as usual we get : 
B— A = - 1-342 ±-558%, 
C— B = - 10-880 ± -498 7„, 
C—A = - 12-222 + -524 7,. 
In all these cases there is an actual decrease in the relative number of " odd " 
locules as elimination progresses. The decrease of I'S per cent, noted from A to 
B is perhaps not significant, being only about twice its probable error, but the fall 
of 11 per cent, from B to C is about 22 times its probable error and the 12 per 
cent, decrease from A to C is over 23 times its probable error. 
There can be no reasonable doubt, therefore, that "odd" are more likely to be 
eliminated than " even " locules. Naturally one locule cannot be eliminated 
alone, but it has seemed interesting to work through the results for individual 
looules. We turn now to the more difificult, but more significant, comparison of 
individual formulae. 
The frequencies, absolute and relative, appear in Table XIX. Diagram 6 shows 
TABLE XIX. Frequency of Ovaries of Different Locidar Composition 
in the three Series. 
Formula 
A 
B 
C 
/ 
°/o 
/ 
./■ 
7o 
3 "even" 
2 " even," 1 " odd " 
1 " oven," 2 " odd " 
3 "odd" 
595 
788 
573 
139 
28-401 
37-613 
27-351 
6-635 
741 
936 
633 
155 
30-061 
37-970 
25-680 
6-288 
1265 
928 
418 
93 
46-783 
34-320 
15-458 
3-439 
Totals 
2095 
100-000 
2465 
99-999 
2704 
100-000 
Even Locules 
Odd Locules 
3934 
2351 
62-593 
37-407 
4728 
2667 
63-935 
36-065 
6069 
2043 
74-815 
25-185 
