A quantitative Study of Variation, Natural and Induced, etc. 
195 
Plant No. 250—14. 
Height 
Pedigree Chem. St. Dev Coef. of Var. 
250—I4 C 727 ZnSO, 5.701 + 223 8.78 + 343 
an 14 0754 C,HC1,0 + H,O 4-940 + 262 776+ 411 
» 140729 ZnSO4 4-997 + 214 780+ 334 
» 140730 ” 5.959 + 273 9,07 + 416 
» 4a = 4.021 + 135 6.95 + 234 
Width 
+ 14 C 727 ZnSO, 4-560 + 178 12.54 + 498 
% 14.0754 C,HC1,0 + H,O 3.746 + 198 10.42 + 558 
> 14 C 729 ZnSO, 4.264 + 183 12.31 + 535 
» .14€ 730 » 4.672 + 214 13.05 + 609 
mn ida -- 3-215 + 108 9.86 + 332 
Number of Branches 
ae 727 ZnSO, 1.861 + 071 9.23 + 361 
5 140754 C,HC1,0 + H,O 1.965 + 104 9.84 4 521 
» 140729 ZnSO4 1.773 + 076 9.14 + 391 
„ 140730 » 1.483 + 068 7.355 337 
» 14a = 1.472 + 050 7-43 & 250 
Number of Seed Pods 
14 C 727 ZnSO, 59.042 + 2.307 23,02 + 946 
ms 14. 0754 C,HC1,0 + H,O 54.239 + 2.874 21.38 + 1.184 
r 14 C 729 ZnSO, 51.683 + 2.214 23.21 + 1.047 
» 140730 „ 52.889 + 2.424 25.39 + 1.237 
5 14a — 66.187 + 2.232 28.34 + 1.030 
For the characters height, width, and number of branches, the 
injection treatments show marked increase in variability. For the 
character number of seed pods the treatments show less variation than 
the untreated. In nearly every case the chloral hydrate shows less 
effect than the zinc. 
It is scarcely to be supposed that the injection of a stimulant 
into an ovary would make the progeny of that ovary less variable 
than the species. Results which tend to show such an effect must 
be put under the head of uncontrollable experimental error. 
A much more minute and detailed analysis might be given here 
of these tables, taking up each constant and its probable error by 
itself. All of the data are presented so that such detail is easily 
obtainable by observation, therefore it seems that further discussion 
is unwarranted. 
It was noted that the injections were more effective in increasing 
the variability in some lines than in others. A comparison of plants 
13* 
