C. Cool and A. N. Koopmans 
43 
If we consider the different distributions in the horizontal rows of Tables 11 
and III in which the maximum numbers are printed in heavy figures, we become 
convinced that besides the numbers of the principal series such as 8 and 13 (and 
multiples of numbers of this series such as 15 and 16), also numbers of the first 
parallel series such as 11 and 18 (and perhaps multiples of numbers of that series, 
14 for example) are not infrequent. 
Frequency of 
the lateral umbels 
cooi- 
FlG. 3. Pastinaca sativa. 
It is certainly very remarkable that with the increasing number of rays of the 
terminal umbel or with the increasing number of lateral umbels per plant, the 
lateral umbels that occur as maxima in a horizontal distribution possess a number 
of umbel rays that leaps up from 11 in one to 13 in another horizontal distribution; 
in other words: j . ; 
The number of umbel rays 12 does not occur as a maximum in any of the 
horizontal groups of the two correlation tables. 
