54 Nebraska Agricultural Exp. Station, Research Bui. 7. 
The mean internode lengths, as calculated from the first five 
internodes, of the garden-grown parent races and Fi are given in 
Table 6. Snowfiake and Tallbush had mean internode lengths 
of 22.65 ±0.32 and 44.76 ±0.93, respectively. The mean of Fi 
was 29.62 ±0.59, which is considerably below the average of the 
means of the parents. While the coefficient of variation of Fi, 
17.23 ± 1.45, is somewhat greater than that of the parents, 15.81 ± 
1.01 and 12.76 ±1.50, it is not sufficiently so to demonstrate a 
significant difference in variability. 
Data for Fo of the Snowflake-Tallbush cross are given in Table 
7. As noted above, these plants were grown in the greenhouse 
during winter. Only a few plants of the parent races and only 
one plant of Fi were grown for comparison. Tallbush responded 
to the relatively high temperature and humidity and weak light 
of the greenhouse much more pronouncedly than did Snowflake, 
the internode length of the few plants grown being more than twice 
that of the same race as grown in the garden the summer before. 
It seems quite possible that a similar difference in response to the 
greenhouse conditions on the part of the several plants of F2 
may account in part for the rather remarkable range of variation 
in internode length exhibited by that lot of plants. The average 
length of the first five internodes of the F2 plants included in its 
range the extremes of the parent plants. It is noteworthy that 
this variation was quite as marked in the pole beans of Fo as in 
the bush plants. The tendency to produce long internodes, 
characteristic of the bush parent, was transmitted to a part of 
the pole-bean as well as to a part of the bush-bean offspring. 
Quite as noticeable is the fact that the tendency to form short 
internodes, a characteristic of the pole-bean parent, was trans- 
mitted to a part of the bush plants as well as to a part of the pole 
plants of F2. Here, just as in crosses between tall pole beans and 
short bush beans, habit of growth segregated in a 3-1 way — 
88:31 to be exact — but both determinate and indeterminate 
types of plant were in fact very different from the respective 
determinate and indeterminate parent stocks. 
While the internode length of Fi was distinctly intermediate 
between the internode lengths of the parent races (Table 6) and 
while the internode lengths in Fo ranged from one parent type to 
that of the other (Table 7), the height of the Fi plants was by no 
means intermediate between the parents, nor was the Fo range in 
height confined to the parental extremes. The heights of the Fo 
plants are shown in Table 8. The few very long internodes of the 
determinate parent, Tallbush, as grown in the greenhouse, made 
it practically equal the height of the indeterminate parent, 
Snowflake, with its more numerous but much shorter internodes. 
