362 
T. H. GOODSPEED AND R. E. CLAUSEN 
are distinctly smaller than those borne by the laterals which began 
flowering late in the growing season. As in the previous cases these 
tables represent comparisons made between flowers measured on the 
same dates on the same plants. The difference in size here holds true 
for both spread and length of corolla. With reference to the data 
on this point given, for 13 22/07 in Tables XVa and X.Yb another 
Table XVa 
Frequency Distribution for Corolla Spread of Flowers of /j^Vo7 
Position 
Class Centers in Millimeters 
No. 
Mean 
Coef. Var. 
19 
20 
21 
22 
23 
24 
25 
26 
27 
28 
29 
30 
31 
32 
33 
34 
35 
On laterals 
On terminals 
I 
2 
4 
8 
4 
18 
17 
19 
42 
26 
48 
15 
53 
12 
41 
8 
47 
7 
48 
I 
25 
21 
4 
I 
2 
383 
116 
27.55i.O9 
24.99 dr. 14 
9.67±.24 
8.67=t.38 
Difiference between means 
2.56=1=. 17 
Table XVb 
Frequency Distribution for Tube Length of Flowers of JJ^^/o: 
Position 
Class Centers in Millimeters 
No. 
Mean 
Coef. Var. 
38 
39 
40 
41 42 
43 
44 
45 
46 
47 
3 
I 
3. 
II 
9 
24 37 
16 I30 
84 
29 
99 
19 
94 
7 
27 
6 
383 
116 
43.7o=t.o5 
42.46rb.10 
3-45 ±.08 
3.60rb.l6 
On terminals 
Difference between means 
I.24rfc.II 
interesting fact is brought out. The differences between the size of 
flowers borne on different parts of the plant correspond to those of 
the two Fi hybrids, but the amount of difference is considerably less 
and the differences for spread and length of corolla do not correspond 
so closely. This is explained by the fact that the 20 plants upon which 
the measurements were taken were practically the only ones which 
had not gone almost entirely out of flower. As noted in the field 
records at the time, the inflorescences on the laterals were covered 
with developing seed capsules, while the flowers measured on the 
terminal inflorescences were produced from adventitious buds among 
dry seed capsules that had dehisced. Physiological conditions within 
the plant operating to throw the balance of the products of metabolic 
activity to the production of seed rather than to the formation of new, 
normally large flowers, are more equally operative in the case of both 
the terminal inflorescences and the lateral inflorescences of 13 22/07 
