386 SEMI-CENTENNIAL OF TORREY BOTANICAL CLUB 
The table shows that there is a considerable negative corre- 
lation between length of blooming period and rate of decrease. 
The high values for the rate of decrease all fall in the first group, 
that is the group containing the plants with the shortest blooming 
periods. The fifth group, which is the group of plants with the 
longest blooming period, has the lowest values for the rate of 
decrease. 
TABLE 17 
CORRELATION BETWEEN LENGTH OF BLOOMING PERIOD AND RATE OF DECREASE. 
ATA FOR IIO Fi PLANTS, 3 YEARS OLD 
Рав ға t (X100) 
ос | Total 
0-1 | 1-2 | 2-3 | 3-4 | 4-5 | 5-6 | 6-7 | 7-8 | 8-9 | g-10 | 10-11 
40—50 Des аркы Ы о Unt tre тала Ұлу ee Шул: Xu seu. 
50—60 I I S a a 2 |... 
60—70 ТІНІ X I 
70-80 Ebay Mao. I 3 I 
80—90 I I а А E 6 
90-100 І Uoc pow Y I I I 6 
IO0—IIO 2 I 5 I ЕЛҮ хетт А 
110-120 І ЛО ре аа ET сори 
120—130 ї 7 8 9 Viet ES 32 |} 4 
130—140 domo ca T ape uds 10 || 5 
140—150 2 Sd x 8 |) 
Total... 3 19-127 | eg из | таз 2 I 2 I IIO 
Қ = — 0.67 
The average flower number was calculated in successive twenty- 
day periods for each group. TABLE 18 gives the average flower 
number for these twenty-day periods. The five groups are very 
much alike, excepting that there is, perhaps, a somewhat greater 
decrease between the first and second twenty days in the plants 
DIAGRAM ACCOMPANYING TABLE I8 SHOWING CURVE FOR AVERAGE DECREASE FOR 
'UCCESSIVE TWENTY-DAY INTERVALS OF BLOOM 
