478 Mason . — Growth and Abscission in Sea Island Cotton . 
Fig. 13. Growth-rate of boll, evaporation, and rainfall. 
The Growth-rate of the Boll at Different Stages 
DURING THE FLOWERING PERIOD. 
The results which are reproduced graphically in Fig. 14 were obtained 
by tagging sixty flowers (on the second group of plants) weekly throughout 
the flowering period and measuring daily the growth-rate made by each 
lot for the six days following the flowering stage. Bolls which were shed 
within this period are not included in the results ; their number is shown on 
the graph within the circles. The coefficients of variability of the daily 
growth-rates and also the daily rate of boll-shedding for the whole group 
have also been included. 
The continued decline in the growth-rate of lots 5, 6, 7, and 11 is the 
first point deserving comment. It will be seen that this decline was 
accompanied by a marked increase in the coefficients of variability of the 
