12 
Harris, A quantitative study of the factors influencing etc. 
end of the pods. That is, seed weight increases towards 
the Stigma. The change seems in some cases to be sen- 
sibly linear. In other cases, however, the mean weight 
increases fairly rapidly at first, then the rate of in- 
crease falls off and finally the seeds become lighter 
towards the distal end of the pod. 
Cold Spring Harbor, N. Y., U. S. A. 
Oct. 23, 1912. 
Explanation« of Diagrams. 
Figure 1. Regression straight lines and their empirical means for the 
relationship between ovules per pod and weight of seeds, and for seeds per 
pod and weight of seed. Relationships for ovules represented by solid dots 
and firm lines; mean weight for seeds represented by circles and broken lines. 
Note the small slope of the lines and the great irregularity of the means. 
Figure 2. Percentage of ovules developing into seeds in various positions 
in the pod. 
Figure 3. Regression straight lines and observed means showing change 
in weight from the base to the tip of the pod in the NH series. Note that 
regression is clearly non-linear. 
Figure 4. Regression lines for the GG series. Regression is apparently 
linear within the limits of the errors of sampling. 
