942 
Joumal of Agricultural Research 
Vol. XXVIII, No. 9 
only 61 days, r while Acala produced flowers for 81 days. The short flowering 
seasonJofJLone Star in both years is noticeable in figure 3. Nevertheless, the 
total number of flowers and also the yield of this variety do not compare un¬ 
favorably with the varieties which continued to flower much longer. Mebane also 
had a veryjshort flowering period in 1923 but was able to set a large number of bolls. 
Fig. 2.—Average rate of growth for 25 plants in each variety from June 25 to September 10, 1923. 
The period of active flowering is apparently closely related to the period of 
active growth of the plants, which is shown by comparing figure 3 with figures 
1 and 2. Under the conditions of the experiment the short growing season of 
Lone Star was also reflected in the short flowering season, and the lengths of the 
flowerihg periods of the other varieties are also proportionate to the length of 
their respective growing seasons, except that flowering may cease through shed¬ 
ding of squares. The Pima plants, however, though they continued growing 
