136 Variation and Inheritance in Aphis 
TABLE III. 
Frontal Breadth (AB) and Length of Antenna (CD), Second Generation. 
Length of R. Antenna : Unit = 2 divisions, = 0442 mm. 
a . 
.2 a 
> ^ 
TO O 
J?' 
i> 
1 
o 
1 
Co 
C3 
S5 
Co 
1 
so 
C5 
»h 
so 
1 
So 
so 
1 
i> 
So 
SO 
1 
c> 
SS 
So 
?5 
-4 
1 
T 
05 
T 
Oi 
1 
C) 
Oi 
l-H 
10 
Totals 
13-0—12-9 
1 
— 1 
1 
13-U—13-9 
1 
0 
4 
2 
2 
13 
1JI.-0—14-9 
2 
13 
9 
9 
7 
1 
48 
15-0— 15-9 
1 
12 
20 
24 
18 
17 
5 
97 
16-0— 16-9 
1 
2 
7 
22 
25 
22 
7 
2 
2 
90 
17-0— 17-9 
8 
13 
16 
23 
17 
6 
2 
85 
18-0— 18-9 
7 
3 
9 
4 
3 
1 
27 
19-0— 19-9 
1 
0 
3 
3 
7 
Totals 
1 
2 
12 
31 
33 
42 
55 
56 
51 
33 
31 
15 
5 
1 
368 
The smaller individuals in the series, which, however, appeared mature in that 
they had very nearly ceased to grow, tended to have an antenna relatively shorter 
than in the larger animals. I took the frontal breadth as a criterion of the general 
size of the body and instituted a correlation table between it {AB) and the ratio 
/ CD\ 
> Table IV. Since AB is the same number in both cases there should be a 
negative correlation if there be no organic correlation. As a matter of fact the 
coefficient of correlation is + 3200 + 'OSIG ; the standard deviation of AB = 1'341.5 
CD 
and of = 1-83G3. 
AB 
TABLE IV. 
Frontal Breadth {AB) and Ratio > Second, Generation. 
Ratio : Unit = 1 hundredth of Breadth. 
rH 
II o 
-I 
-tJ Si 
CO 
91 
91 
00 
s= 
<ij 
1 
1 
©! 
1 
e* 
1 
0* 
1 
1 
1 
®f 
1 
Totals 
"-^ 
■"i> 
'-I 
e-> 
<Si 
Of 
OJ 
®* 
12-0— 12-9 
1 
1 
13-0— 13-9 
1 
0 
0 
5 
3 
0 
3 
0 
1 
13 
U-o—u-9 
4 
8 
8 
8 
6 
8 
4 
1 
1 
48 
15-0~-15-9 
6 
8 
19 
16 
19 
18 
7 
4 
97 
16-0— 16-9 
1 
2 
7 
19 
23 
18 
14 
3 
1 
2 
90 
17-0— 17-9 
8 
13 
16 
15 
23 
8 
1 
1 
85 
18-0— 18-9 
2 
4 
4 
8 
6 
3 
0 
1 
27 
19-0— 19-9 
1 
0 
2 
4 
7 
Totals 
1 
11 
18 
50 
63 
70 
75 
53 
20 
3 
4 
368 
