I 38 THE AMERICAN NATURALIST. [Vor. XXXVI. 






















































































































25 
20 
i. A 
TI SN 
i 
10 |l 
iil 
|i 
|l 
ii 
5 |i 
|i 
Lil 
21 31 4 
Fic. 25 
I 
der dw d EJ d 
& si TT arem 
—— oe ae ay 
; ELA aa aa Nae 
—À — 4—— a ———À—— 
ARA San 
5 ase aS 1: 
Ree if 
| HEU 
10 iol | T] | 
cee i 
os ia EE RA 
I metet n 
: 30 : 20 30 
21 3 uu 2i 3l iH 
« 39. 
Fic. 25. — Aster ebrei Muhl. eras curve of 117 heads collected on September 27. Classes 
doubled 547; mode — 26-27, 32-35; Lid -9858 ha 173749. 
Fie. 26. — A e Prenante tit Mobi. E curve of 143 wee 30. Classes 
oubled. Mean = 28.706293 = .201316; m 30-333 € = 3.569141 + n ic 
h 
. FiG. 27. — Aster prenanthoides Muhl. ted curve gt 139 kad collected on October 4. Classes 
doubled. Mean = 28.251798 + .200320; modes = 24-25, 28-29, 32-33 ; € = 3.501476 + . 141641. 
