48 Nebraska Agricultural Exp. Station, Research Bui. 7. 
Since the behavior of July with respect to mean lengths of 
the first five internodes has been shown to be so irregular, it could 
hardly be expected that the crosses between July and the bush 
beans, Triumph and Red Marrow, would give reliable evidence of 
segregation of internode length factors from measurements of 
the first five internodes. But there is no other comparison available 
for the Fo bush segregates of these crosses. The coefficient of 
variation of the Fo bush segregates of the July-Triumph cross 
(Table 4) was less than that of July by 10.80 ±3.74 and practically 
the same as that of Triumph, the difference being only 0.19 ± 
2.93. The coefficient of variation of the Fo pole segregates of 
this cross was slightly greater than that of the bush segregates 
but not equal to that of July, the difference being 5.40 ±3.29 
and 5.40 ±3.28, respectively. In Fo of the July-Red Marrow 
cross, the coefi^icient of variation for mean length of the first five 
internodes was much greater than that of Red Marrow and 
somewhat greater even than that of July. In the statement 
below, the pole-bean segregates of Fo of the July-Red Marrow cross 
are compared with July and the bush-bean segregates with Red 
Marrow. The calculations were made from measurements of 
74 plants of July, 71 of Red Marrow, 57 of the F2 pole-bean 
segregates, and only 12 of the Fo bush -bean segregates. The 
coeflRcients of variation of these four lots of plants for each of 
the first five internodes are: 
Internode No 1 2 3 4 5 
July-Red Marrow, Fo pole 19.65 27.52 48.62 66.06 49.06 
July 17.08 24.36 35.40 47.16 45.25 
Difference 2.57 3.16 13.22 18.90 3.81 
Internode No 1 2 3 4 5 
July-Red Marrow, F2 bush 19.46 15.74 46.27 52.54 64.27 
Red Marrow 15.20 22.15 20.51 23.18 28.28 
Difference 4.26 -6.41 25.76 29.36 35.99 
That such differences in the coefficients of variation as those 
between July and the Fo pole-bean segregates, as given above, 
are indications of segregation in Fo of internode-length factors 
which differentiate the parent races seems unlikely. 
The Fo segregates of the July-Triumph cross showed consist- 
ently smaller coefficients for the first five internodes considered 
individually than did July, notwithstanding the fact that July 
and Triumph differ more in mean internode length than July 
and Red Marrow and probably also, therefore, in more internode- 
length factors. The whole question with respect to these crosses 
can be decided only by further investigation if indeed any decision 
can be reached from measurements of only the first five internodes. 
It may be noted here, tho this will be presented in detail later. 
