Boas: INDIVIDUALITY OF THE BEAN POD 209 
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52 = ^ (I — 7) о? 
From this calculation the amount of correlation of the beans within 
a pod (r) has been determined to be + 0.29. 
It appears from this that the pods exhibit individuality just as 
the plants do. The individuality of the pods is of almost the same 
order as that of the plants, the average standard deviation for the 
beans within a pod being + 4.3 and for the individual plants + 3.4. 
These studies do not show what the individuality of the pods 
is due to, whether to purely chance physiological differences as 
differences in nutrition or to definite morphological differentiation 
according to position of the pod on the plant. As has been men- 
tioned before, there are many instances in which differences be- 
tween homologous organs have been correlated with morphological 
position or time of development. I believe that the morphological 
position of the pod bears some relation to its individuality. I 
cannot now present quantitative results, but the material studied 
so far shows that there are slight differences in the form of the 
beans of the lowest and uppermost branches. 
A further question to be investigated is whether such mor- 
phological differences as discussed in this paper may be inherited. 
As far as I know, there has been no work that would either prove 
or disprove the inheritance of such differences. Соггепѕ made 
some attempt to grow offspring from ray- and disk-flowers of 
Dimorphotheca pluvialis, but his material was meager and the 
results inconclusive. In pure-line breeding small individual dif- 
ferences between plants have been selected out and have main- 
tained themselves for successive generations, and it is at least to 
be tested whether similar pure lines may not be obtained from a 
single individual. 
I have material at hand, and I hope at some later time to be 
able to report on these questions. 
