r THEORY OF STATISTICS. 
afford a good illustration of this form of distribution, but marred 
by the unequal intervals so common in official returns. 
TABLE XIV. —Showing the Frequencies of Different Numbers of Petals Sor 
Three Series of Ranunculus bulbosus. (H. de Vries, Ber. disch. bot. Ges., 
Bd. xii., 1894, g.v. for details.) See Fig. 17. 
Frequency. 
Number _ _ 
of Petals. 
Series A. Series B. Series C. 
5 312 345 133 
# 17 24 55 
4 7 | 23 
2 — 7 
1 2 2 : 
10 —~ - } 
Li _ 
Total oor ong eng 
The type is not very frequent in other classes of material, but 
instances occur here and there. Table XIV, and fig. 17 show 
Sa 
3 
io. 
5 | | | Ho 
S 0 Ey... of E, ] Fl  — . l - 
SEGINT NSO SHGCRT 8 FiO SRC SNINID 
F16. 17.—Frequency-distributions of Numbers of Petals for Three Series of 
Ranunculus bulbosus: A 337, B 380, C 222 observations, (Table XIV.) 
distributions of this form for the petals of the buttercup, Ranun- 
culus bulbosus. 
16. The U-shaped distribution, exhibiting a maximum frequency 
202 
an 2a