SrouT & Boas: STATISTICAL STUDIES IN CICHORIUM 383 
TABLE 16 
CALCULATION OF FLOWER NUMBER OF FIRST DAY OF BLOOM (a) AND SEASONAL RATE 
F DECREASE (b) FROM THE DATA FOR A PLANT OF BARBE DE 
CAPUCIN (Es) PRESENTED IN TABLE I 
о т+а | o(r 4- 4) (d + т)? 
| 
+34 о — 3I | — 1054 9бт 
2.5 I 30 | O0 ДЕЙ 900 
2.5 2 29 | ^ 425 841 
2.7 5 26 | 702 ‚676 
1.9 7 24 | 456 576 
1.6 II | 20 | зоо 400 
I.9 I3 | 18 | 342 324 
0.7 15 | 1б | II2 256 
I.5 18 , I2 | I95 169 
I.4 20 MAST | 154 I21 
1.6 23 | 8 | 128 64 
Id 25 | 6 | 66 36 
3.0 26 | 5 | 150 25 
0.8 28 | З 24 9 
0.3 30 | I єр» I 
OL 33 | раз 14 4 
0.8 35 | 4 + 32 16 
0.4 37 6 | 24 36 
1.6 40 | 9 | I44 81i 
I.0 44 | 13 | 130 169 
1.0 47 | 16 | 160 256 
1.0 50 | I9 ! 190 361 
1.4 55 | 24 15.2 536 576 
0.8 бо | 29 232 849 
14 64 | 33 462 1089 
2:6 67 | 36 540 1206 
1.4 | 43 | 602 1849 
[o] 18.0 4- o.6 30.7 | [ot] = — 29.49 [?] = 441.96 
[т +d] = 3-43! | au 
Substituting in formula derived above 
(2) - 29.49 = + о.3(а + 31b) + 441.96b — (0.0902) (last value so small that it 
may be neglected) 
(3) T 0.18 = + o.3(a + 31b) 
а = 18.0 + 2.6 = 20.6 
The question will immediately arise whether the assumption 
of a uniform rate of decrease is justified. If there were only 
meager data at hand for each plant it would be necessary to use the 
mean and the standard deviation as values. In such cases it would 
be recognized that such values are not the most satisfactory ex- 
pression of flower number, but that they are the best available 
from the material at one's disposal. In chicory, however, there 
