120 THE AMERICAN NATURALIST. 
[Vor. XXXVI. 
TABLE C.— CONSTANTS OF ASTER PUNICEUS L. 





INDiviDUAL | IwDbiviDUAL 
OV. | Now 2. 
337 heads. | 246 heads. 
Mean. . . 42.501483 | 45.378048 
| Modes : 
|A-D.. . .| 3965747 | | 3.140095 
BRACTS Jig... 4.760197 | 3.959072 
||P. E. A. D. | + 3210752 | + 2.670394 
[IP E. M... |] E 04901 x .170258 
FE i .123673 | + .120390 
CV. 11.200072 8.724641 
Mean... -| 35.020771 36.321138 
Modes : 
NE gXEK ui 3.039368 3.421607 
Bi N ul 3.904214 4-297721 
Poe A. D. + 2.633392 | + 2.898813 
EM- . | x -143450 | + -184821 
P.E.c . .| + .101434 | + .130688 
EIC Vie s 11.148282 11.832838. 
f|Mean. . .| 60.513353 | 76.609756 
Modes ‘ 
Disk 4 A. D. 5.805756 | 8.068 
m> 7.338405 | 10.083765 
P. E. A. D. | + 4.949754 | + 6.801500 
P.E.M + .26963o | + .433647 
P.E. v + .190657 | + .306628 
tic: v. 12.126919 | 13.162508 






INDIVIDUAL SUMMATION, 
No. 3. OS. 1, 2, and 3. 
215 heads. 
46.795348 | 44.546365 
35 39% 49, 
46, 48 
2.377 501 3.571510 
3-035446 4-497254 
X 2.047408 | + 3.033397 
+ .139632 | + .107381 
+ .098734 | + .075929 
6.486640 10.09 5669 
39-660465 36.671679 
7h 3» 37 
3-175164 3-577188 
4.018685 4.480251 
+ 2.710603 | + 3.021929 
+ .18486r | + .106975 
+ .130716 | + .075642 
10.1 32723 12.217198 
74.241860 69.174185 
57-58, 63-64, 
67-68, 73-74, 
"d 
5.644478 8.947764 
7.115330 11.116989 
+ 4.799290 | + 7.498400 
+ .327308 | + .265440 
+ -231442 | + .187694 
9.583987 | 16.071008 


This work on Aster puniceus L. shows what a wide difference 
may exist, even in such constants as the means, standard devi- 
ations, and coefficients of variability, in individuals growing 
under apparently identical conditions. 
In Fig. 14 is shown the correlation surface for rays and - 
_ bracts of all the heads counted. The coefficient of correlation 
was .705100 + .009194, while that for rays and disk (Fig. 15) 
was 674928 + 010045. t 
