STOUT & Boas: STATISTICAL STUDIES ІМ CICHORIUM 419 
TABLE 39 7 
FLOWER NUMBER PER HEAD (а) FOR ONE-YEAR, TWO-YEAR, AND THREE-YEAR-OLD 
PLANTS 
One year old Two yearsold | Three years old I a | » 
FD er Caen 
"en Average MA. Average ша. Average и... yearto | years to 
ё cases a cases 4 cases ите | ne 
| 
Gu eeu ACIES 18.8 36 20.6 55 21.0 | 105 +08 | +04 
ei a ӨН s 19.1 9 20.7 IO 20.9 35 + 1.6 0.2 
Ез X А). I9.7 5 20.4 6 20.0 II + 0.7 — 0.4 
D b er щ Іт; 18.6 6 әгі 8: | 19.8 12 + 0.5 - 0.3 
ГА deron 23225. 18.4 3 20.3 6 то.т + 1.9 — 0.8 
CK Ea) р 20.1 4 21.5 5 21.4 16 + 1.4 — 0.1 
Dp) yt hs 18.4 4 20.4 бб. 7 + 2.0 — 1.0 
Са) з... I9.3 2 21.0 8 20.5 8 + 1.7 - 0.5 
= „жаз а Ga cud 18.1 3 19.8 6 20.0 7 + 1.7 + 0.2 
UA NR 552253 18.5 63 I9.4 23 — — + 0.9 on 
(A X En)-4-....| 20.5 IO 20.0 3 — — — 0.5 — 
(Ез X A)-r0— 
DERE ui 17.6 II 18.2 IO ска, E + o.6 -u 
(Ex ХА)-то- 
DF S o n. 17.Y 15 -- Se ва se ETA n 
(Es X A)-—4-Ser | | 
А КОР NETS I9.7 IO 10.5 | то — — — 0.2 == 
(Es X A)-4-Ser | 
EI US xn 10.2 17 — | — е mm ud sym Lite 
increase of the second year over that of the first is just twice that 
of the third year over the second year. The Fz generation has 
been studied only for the first and second year of growth, but has 
shown practically the same increase as did the Е. 
In regard to the behavior of the rate of decrease in successive 
years, it has been pointed out earlier in the paper that the rate of 
decrease becomes less as the blooming season becomes longer. 
Older plants are more vigorous than one-year-old plants and 
bloom longer. Because of this fact the rate of decrease becomes 
less as the plant grows older. The question whether various lines 
of descent are exhibiting diverse types of behavior, which are, 
however, characteristic of particular lines, will be more fully 
considered later. 
6. VARIATION IN RANGE AND DISTRIBUTION OF MODAL 
NUMBERS | 
A survey of the facts regarding the maxima or modal numbers 
in chicory are of interest in relation to the question of specificity 
of flower number. | 
