HARRIS: OVULES AND SEEDS IN CERCIS 637z 
The coefficients for the correlation between the number of 
ovules per pod and the capacity of the pods for developing their 
ovules into matured seeds as determined from the formula 
For — Uo/U, 
"VI — Pot + (Tos — Vols)? 
are all very low and are either positive or negative in sign, for 
these individual trees — presumably more homogeneous than the 
ce 
Yo 
REGRESSION OF 
SEEDS PER POD ON 7s 
OVULES PER POD e, 
H i 
| 
a 
MEAN SEEDS 
RN 
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iy 
‘ 
MEAN OVULES | 
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4 S 
Fic. 1. Regression line and empirical means for tree 9. 
general samples. Regarding probable errors, only four of the 
thirteen can be considered to differ significantly from 0. Ten 
of the thirteen are negative. All those which are significant 
with regard to their probable error are negative in sign. 
Smaller collections from 100 trees were gathered shortly after 
those described above for the purpose of having more numerous 
individual samples for testing the results already stated. Separate 
Correlation tables showing the relationship between the number 
of ovules formed and the number of seeds developing were drawn 
up for each tree. Of course it is impossible to publish all these. 
The constants which interest us here are (a) the coefficient of 
