C. Cool and A. N. Koopmans 
47 
In this table also the numbers 8 and 10 are conspicuous just as in the sub- 
divisions not reproduced here of each horizontal row in the above table, which 
were made according to the number of rays of the terminal umbel. 
It is remarkable that there is not a single case of Anthriscus sylvestris in which 
a number of 9 umbel rays in a horizontal row of one of the Tables V and VI occurs 
as a maximum, whereas the numbers 8 and 10 not infrequently occur as modes. 
Frequericy oj 
the lateral umbels 
350 
300 
250 
200- 
"9 10 11 12 13 14 15 16 17 18 ^9UMBELRAYS 
Fig. 5. Anthriscus sylvestris. 
Figure 5 gives a graphical representation of the variability of the number of 
umbel rays of these 1632 lateral umbels. 
(4) Countings of Sil^m latifolium. 
» 
Variation of the number of tuiihel rays of the terminal umbel. 
The number of plants examined of Sium latifolium was much smaller than 
the number of plants of the preceding species, which were submitted to examina- 
tion. Only in the case of 127 plants were the umbel rays of terminal umbels and 
lateral umbels counted, and of one only of the umbel rays of the lateral umbels, 
because the terminal umbel was missing. 
