206 
Journal of Ay/icultural Research 
Vol. XXV, No. 4 
Table XI .—Volume and green weight per boll at seven-day intervals of Sea Island and 
Meade cotton , near Charleston, S . C., 1922, based on the average of 50 bolls collected 
at each age 
Age of boll. 
Sea Island. 
Meade. 
Volume. 
Green weight. 
Volume. 
Green weight. 
Days . 
Cc. 
Gm. 
Cc. 
Gm. 
7 
2. 40 
2. 24 
4. 78 
4. 26 
14 
J 3 * 13 
IO. 91 
21. OO 
18. 23 
21 
19 - 95 
16. 16 
29. 22 
26. 64 
28 
18. 50 
I 5-65 
3 °- 3 ° 
2 7 - 53 
35 
19.63 
15. 81 
3 °- 63 
27. 88 
. 42 
19. 61 
15. 88 
2 9 - 53 
26. 65 
49 
19. 00 
i 5 - 23 
22. 70 
s6 
1 6. 79 
j 
63 
1 5 - 70 
1 Open bolls. 
MATURATION PERIOD OF SEA ISLAND AND MEADE BOLLS 
A mean maturation period of 57.6 ±0.013 days was obtained for Sea 
Island bolls near Charleston in 1922, from data recorded from bloom to 
open boll on 988 bolls. The period of maturation showed a definite 
increase as the season advanced. A mean period of 56.9 days was 
obtained from bolls set from flowers blooming between June 22 and 28, 
while a mean period of 62.6 days was found for those set from flowers 
blooming between August 3 and August 6. The probable errors for these 
periods were ±0.23 days and ±0.60 days, respectively, showing that 
the increase in the period of maturation is significant and not due to 
chance. 
The mean period of maturation for the Meade variety at Charleston 
in 1922 was 56.14 days, as determined from 277 bolls, with a probable 
error of ±0.11 days. A tendency for the period of maturation to increase 
as the season advanced was noted, but the data are not presented on ac¬ 
count of the small number of bolls and the shortness of the period 
during which they were set. It is of interest to note that there is a dif¬ 
ference of only one day between the mean maturation period of Sea 
Island and Meade bolls in this location. In other words, the Sea Island 
bolls require, on the average, about one day longer to open than the 
Meade bolls. 
SUMMARY 
(1) Data relating to the growth of the cotton plant are given, including 
the rate of floral bud production, the period of development from the 
appearance of a floral bud to flower, and the growth of the boll from 
flower to maturity. This information is needed in connection with 
cultural methods and weevil control problems. 
(2) A comparison of similar phases of plant growth and development 
was obtained on several varieties under widely different environmental 
conditions—namely, Lone Star, Acala, Durango, and Pima Egyptian, 
at Sacaton, Ariz., in 1921 and 1922; Lone Star, near Greenville, Tex., in 
1922; and Meade and Sea Island near Charleston, S. C., in 1922. 
