44 
Variation and Gorrelation in Umhelliferae 
(3) Countings of Anthriscus sylvestris. 
Variation of the numher of umbel rays of the terminal umbel. 
A little preliminary investigation showed that the number of umbel rays of the 
terminal umbel of Anthriscus sylvestris is very small and that in most cases this 
umbel consists of 1, 2, 3 or 4 umbel rays and in some cases of 5, or is entirely missing. 
Afterwards four countings were made: 
{a) On 502 plants in the neighbourhood of Beverwijk on May 16th, 1912. 
(6) On 305 plants in the neighbourhood of Lisse on May 26th and July 16th, 
1912. 
(c) On 77 plants partly in the neighbourhood of Lisse, partly in that of 
Bentveld, on July 6th, July 19th and July 27th, 1912. 
[d) On 46 plants from the Schapenweg in the neighbourhood of Rijswijk on 
May 19th, 1912. 
The result of these countings of the number of umbel rays of 930 terminal 
umbels is given in the following table. 
TABLE IV. 
Variation of the mimber of umbel rays of the terminal umbel of Anthriscus sylvestris. 
Number of umbel rays 
of tlie terminal umbel 
0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
Totals 
Number of terminal 
umbels. Group («) 
9 
107 
196 
143 
40 
4 
1 
1 
1 
~ 
502 
Number of terminal 
umbels. Group (6) 
16 
107 
112 
49 
14 
3 
3 
1 
305 
Number of terminal 
umbels. Group (c) 
1 
26 
23 
23 
1 
2 
1 
77 
Number of terminal 
umbels. Group (c?) 
13 
15 
13 
4 
1 
46 
Number of terminal 
umbels. Totals 
20 
2.53 
346 
228 
59 
8 
3 
5 
1 
1 
930 
Mean of umbel rays for 930 terminal umbels =2-125. 
S.D. of umbel raj's for 930 terminal iimbels = 1-119. 
The graphical representation in Fig. 4 of the distribution in the last row of 
Table IV is an asymmetrical polygon with mode at 2 umbel rays. The point 
which is obtained by taking the terminal umbels with 0 umbel rays into account 
