A quantitative Study of Variation, Natural and Induced, ete. 191 
Number of Seed Pods 
250—5 c 624 ZnSO, 49.391 + 1.880 
u 6S COKO C,HC1,0 + H,O 51.487 + 3.311 
Sh E = 52.454 + 1.769 
This table shows the zinc treatment to be much 
22.16 + 883 
18.39 + 1.222 
23.00 + 816 
more generally 
effective than the chloral hydrate in increasing the variability. In 
nearly every case the former has made the constants larger than the 
check, while with the latter they are smaller. 
Plant No. 250—6. 
Height 
Pedigree Chem. St. Dev. 
250—6 c 627 ZnSO, 4.430 + 244 
> 0:8 = 4.035 + 1306 
Width 
616.027 ZnSO, 4.071 + 224 
iM 6a —_— 3.604 + 121 
Number of Branches 
686.627 ZnSO, 2.768 + 152 
» 6a _ 1.601 + 054 
Number of Seed Pods 
Fe OS Oe 7, ZnSO, 62.694 + 3.453 
ay eye. os 56.125 + 1.893 
Coef. of Var. 
6.72 + 370 
6.31 + 213 
a 
bh 
HH 
N 
~ 
> 
We find here that zinc sulfate has increased the standard deviation 
in each instance, and that it has increased the coefficient of variability 
in all instances except one. 
Plant No. 250—7. 
Height 
Pedigree Chem. St. Dev. 
250—7 c 629 Ca(NO;), 4.379 + 248 
» 70639 H,O 3-467 + 252 
» 7a = §-203 + 175 
Width 
= 7.0629 Ca(NOs3)o 4.334 5 245 
» 70639 H,O 3.593 + 261 
» 7a == 4.371 + 147 
Number of Branches 
» 7629 Ca(NO;); 2.368 + 134 
”" 70639 H,O 2.079 + 151 
vu A _ 1.669 + 056 
Coef. of Var. 
7.03 & 398 
5.25 + 382 
7.95 + 268 
13-152 757 
11.33 + 835 
12.71 + 436 
11.78 + 676 
9.82 + 714 
8.66 + 292 
