822 
Journal of Agricultural Research 
Vol. XXIV, No. lo 
The mean, standard deviation, and coefficient of variation of the ratios 
at each node and for the plant as a whole were calculated from the data 
in Table V. These statistical constants are given in Table VI. Figure 
I shows the graphs obtained by plotting the means for each node in each 
NODES 
length of stipule , , , . . j 
Fig. I.— Graphs obtained by plotting the mean ratio ol ^^^idth of stipule fourth to ninth nodes 
of Gradus type (T), Rogue (R), and the Fi and F2 hybrids of crosses between Gradus and Gradus 
rogue, based on data from Table VI. 
group of plants. .The similarity of the F^ and F2 generations to the 
rogue parent is easily seen by inspection of Figure i and Tables V and 
VI. The Fi hybrids up to the seventh node are like the type, or inter¬ 
mediate between the type and rogue; above the seventh node the plants 
become rapidly more roguelike. At all nodes the F^ plants appear 
more variable than Gradus and are like the rogues in this respect. 
