FACTORS INFLUENCING FLOWER SIZE IN NICOTIANA 343 
sowing of the H38 hybrid seed under the designation 191 2, and on these 
same plants of the first sowing cut back and blooming the following 
year on their own roots under the 1913 designations. In 1912 the 
14 or 15 flowers measured on each of the 25 plants of Fi H38 were all 
Table IVa 
Frequency Distributions of Spread of Corolla in Fi Hss 
Designation 
Means for totals, 1913. . . 
Means for totals of same 
plants, 1912 
Means for totals, 1912. ..... 
Meansfor first dates, 1913. . . 
Means for mid dates, 1913. . 
Means for last dates, 1913 . . 
Means for different dates, 
1913 
Class Centers in Mil 
imeters 
No. 
Mean 
Coef. Var. 
34 
35 
36 
37 
38 
39 
40 
42 
43 
44 
I 
2 
5 
I 
4 
3 
4 
I 
21 
39.57zh.32 
549±-57 
2 
6 
8 
4 
21 
35.8i±.i5 
2.81 ±.29 
2 
7 
II 
4 
I 
25 
35. 80 zt. 13 
2.62±.25 
3 
3 
3 
I 
6 
4 
I 
21 
38.81 ±.31 
543±-57 
I 
4 
I 
3 
2 
5 
3 
I 
21 
39.05 =t.40 
7.00 zt. 73 
I 
3 
2 
4 
2 
2 
3 
2 
2 
21 
40.05 d=.35 
5.94zb.62 
2 
2 
3 
3 
2 
4 
5 
21 
39.57=t-30 
5-09=t.53 
Table IVb 
Frequency Distributions of Length of Corolla in Fi Hss. 
Designation 
Means for totals, 1913 
Means for totals of same plants. 
1912 
Means fortotals, 1912 
Means for first dates, 1913 
Means for mid dates, 19 13 
Means for last dates, 1913 
Means for different dates, 1913. . . 
Class Centers in Millimeters 
50 
51 
52 
53 
54 
55 
56 
2 
2 
3 
10 
4 
I 
8 
5 
5 
2 
I 
12 
5 
5 
2 
2 
2 
8 
8 
I 
2 
8 
7 
I 
I 
2 
8 
7 
I 
I 
I 
2 
8 
5 
25 
54.57zb.17 
52.95=t:.l6 
52.80 dz. 14 
55-i9±.i5 
5543±-i5 
53.81 zh.24 
54.90 zb.26 
measured on the same date late in the season, on October 31. These 
plants began to go out of flower during the last week of December and 
were cut back early in February. They soon put out new laterals 
which began to bear flowers early in May. In Tables IVa and IVb 
are given the distributions of means for spread and length of 21 of these 
plants. The remaining four of the original plants were lifted into 
pots and subsequently flowered in the greenhouse. The significance 
of the designation ''means for totals of same plants 1 91 2" is thus 
apparent. Tables Va and Vb are arranged in exactly the same manner 
^s Tables IVa and IVb. Twenty-four plants were originally measured 
