No. 422.] QUANTITATIVE STUDY OF VARIATION 











































































































































e Eee wl wE 
J 
m 
HET 
] 
i 1 
i 
5 
"a 
1 
i 
bz 
+ 
a 
ji 
S 
3s 
1 
31 
i 
5 
[] 
20 
3 n 
+ 
V 
Imi i 
T LE 
E: 
40 50 g » 30 100 d 

FIG. 13. — Scl ee L. Disk curve of 79 
; modes = 



57-38, 63-64, 67-68, 73-74: 79- 

80; d — 11. 
116989 = 
129 
8 heads. Classes doubled. Mean = 69.174185 + 
187694. 
