1910] NAKANO—FLORETS OF ASTER 375 
ning to the end of the flowering season. ‘The mean value of the rays 
decreased from 17.921 to 17.339 during twelve days, but no change 
of the mode was observed, the mode always holding its position on 
_17, which does not belong to the Fibonacci series. However, the 
oscillation of the mode between 18 and 16 may be observed from the 
first and third collections. 
Variation of disk florets 
This material was taken from the same flowers used in the third 
collection, and the constants calculated are as follows: 
Number Range Mode A o c 
2959 c-13 7-8 7.401 I. 329 17.963 
+0.017 +0.012 
Lupwie’s rule did not hold in this case, since the mode falls on 
7 tather than on 8, although 7 is a member of ScHIMPER-BRAUN’S 
accessory series. 
Individual correlation 
I call briefly the correlation between the organs of the same indi- 
vidual the “individual correlation.” PEARSON says (9, p. 392): 
“We have seen that the racial variation is greater than the individual 
variation, that capsules on the same poppy plant are more alike to 
each other than they are to the capsules of a second plant, or the 
leaves of one beech tree to each other than to those of a second beech 
tree. The resemblance of the like organs of the same individual is 
a special case of correlation, and we now want a quantitative measure 
of such correlation.” I have tried, therefore, to find the value of 
the individual correlation, if such exists in my collections, and to 
throw some light upon this problem. For this purpose, I calculated 
the number (R) of classes and the difference (D) of the minimum 
and maximum classes in each individual variation, using the three 
collections mentioned above. 
In the racial variation the class range was 10-31, that is, there 
occurred 21 different classes (one deficient in 11); while in the indi- 
vidual variation, as the above result (R) shows, only 2-10 different 
classes (rarely more than 6) occur, and curiously enough these classes 
happen to be almost continuous, as D clearly shows. From these 
