A quantitative Study of Variation, Natural and Induced, etc. 193 
Number of Seed Pods 
7 10 c 642 ZnSO, 55.552 + 3-449 20.21 + 1.305 
en Io C 774 3, 50.148 + 3.349 18.10 + 1.248 
jr 10'C' 663 Ca(NOsz)o 54.079 + 3.888 19.36 + 1.443 
Si 104 — 50.036 + 1.687 20.93 + 736 
With plant No. 250—10 the injections have increased the standard 
deviation in ten cases out of twelve. The results as regards coefficient 
of variability are not so consistant; but since the number of variates 
are less in the injected lines than in the untreated the standard de- 
viation seems to be the best measure of variability and we would say 
that variability is increased. Ofcourse, other things being equal the 
larger the population the larger will be the standard deviation. 
Plant No. 250—11. 
Height 
Pedigree Chem. St. Dev. Coef. of Var. 
250—I1I c 671 NaCl 5.569 + 239 8.364 359 
55 II c 769 ZnSO, 4.984 + 228 759+ 346 
En I1C 707 CaCl, 5.045 + 248 7-73 + 380 
5 Ila — 4.068 + 137 5:97 + 201 
Width 
250—I1 c 671 NaCl 4.059 + 174 11.20 + 488 
u 11 ¢ 769 ZnSO, 3-956 + 181 11.85 + 548 
A II C 707 CaCly 4.476 + 220 12.97 + 649 
i Ila u 3.364 + 113 9.62 + 32 
Number of Branches 
: I1 c 671 NaCl 2.569 + 110 12.70 + 555 
= 11 c 769 ZnSO4 1.822+ 083 8.97 + 410 
= II cC 707 CaCl, 2.560 + 126 13.37 + 670 
er Ila _ 1.491 + 050 7.73 5 261 
Number of Seed Pods 
A 11 c671 NaCl 66.408 + 2.856 25.00 + 1.139 
N LC :760) ZnSO, 55-395 + 2.530 20.55 + 977 
A II C 707 CaCl, 60.119 + 2.957 22.69 + 1.172 
> Ila _ 34.880 + 1.176 15.61 + 539 
With plant No. 250—11 the results of injection are most striking. 
The variability is markedly increased in each case both as measured 
by standard deviation and by coefficient of variability. 
Plant No. 250—12. 
Height 
Pedigree Chem. St. Dev. Coef. of Var. 
250—12 c 807 Air 5-665 + 283 8.88 + 444 
a 12C\690 C,HC1,0 + H,O 4.874 + 290 4.60 + 274 
5 12 ¢ 706 CaCl, 5.428 + 278 8.00 + 446 
„ 124 _ 3.806 + 128 5.56 + 187 
Induktive Abstammungs- und Vererbungslehre. IV, 13 
