No. 422.] QUANTITATIVE STUDY OF VARIATION 133 



























































































































































































60) 
t 
S t 
t 
z 
50 
% 
| 
^ | 
E T1 
~ | 
MI 
gs HL H 
[| | T 
i! | T 
t 
30 t 
t 
8 t 
* i 
t1 
5 t1 
x 1] 
t] 
i 
i 
20| | tT 
a he See = 
i5 HH 
g TILITLELLLTLA4 
10 HTHIIPHTIIITEERÉ IEEE 
- jJ 1l id dd tt 1-1 
Hia bil -LLEEHH-HHHHC 
HETTHETRITE rH 
7 HH HTT 
A 
- 
itl 
Li 


i5 20 E] p 35 
Fic. 17. — Aster prenanthoides Muhl. Ray curve of 658 heads. 
mod 
Mean = 28.037993 + -107021 ; 
es = 27, 31, 33; T = 4-070971 = .075675 
