i7 
Recent Advances in the Study of Heredity. 
remaining four fall outside it, and finally that amongst these latter 
there is only one in which the deviation is greater than thrice the 
Probable Error, viz. 480, in which the actual deviation is a little 
over three-and-a-half times the Probable Error. This series of 
cases' shows therefore the kind of way in which observation may be 
expected to differ from expectation, and the deviations are just such 
as may be expected in a case of F 2 in which the proportion of 25% 
recessives obtains. 
Classification by yellow grand-parents : — 
Catalogue 
number of 
grand parents. 
Number of 
Yellows. 
Number of 
Greens. 
Percentage 
of Greens. 
Actual 
Deviation of 
Percentage. 
Probable 
Error of 
Percentage. 
477 2 
14,081 
4,532 
24-35 
—0-65 
10-212 
478 
7,172 
2,405 
25-11 
+ 0-11 
10-299 
479 
20,761 
6,951 
25-08 
+ 0-08 
TO-176 
480 
3,978 
1,224 
23-53 
—1-47 
10-397 
481 
2,777 
942 
25-33 
+ 0-33 
10-481 
482 
11,140 
3,715 
25-01 
+ 0-01 
10-240 
492 
14,157 
4,658 
24-76 
—0-24 
10-212 
493 
1,408 
486 
25-66 
+ 0-66 
10-677 
— 
75,474 
24,913 
24-82 
—0-18 
10-092 
Classification by 
green grand-parents 
C/5 
U c 
3°§ 
SO u u 
O 0 ) ^ 
jd a, 
r- . 
3 c 
Number of 
Yellows. 
Number of 
Greens. 
Percentage 
of Greens. 
Actual 
Deviation of 
Percentage. 
Probable 
Error of 
Percentage. 
u c § 
U 
to 
483 
38,565 
12,788 
24-9 
— 0-1 
10-129 
484 
17,150 
5,719 
25-01 
+ 0-01 
+ 0193 
485 
19,759 
6,406 
24-48 
+ 0-52 
10-179 
— 
75,474 
24,913 
— 
— 
" — 
> First published in Proc. Roy. Soc., B., Vol. 81, p. 61. 
2 477 is a native Chinese cultivated Pea. 478, a commercial 
German Pea. 479, this is the type of Pea sold for use with 
the peashooter and reached me through that medium. 480, 
a commercial Pea from Calcutta. 481, Ditto from Canada. 
482, Ditto from Russia. 492, a yellow round Pea from Genoa. 
493, a later sowing of the same strain. 
