FLOWEKS AND BOLLS OP PIMA AND ACALA COTTON 5 
and the mean age at which these fell are shown for the two seasons 
in Table 3. 
Table 3. — Number of squares shed at different ages from 20 plants each of Pima 
and Acala cotton in 1924 and 1925 
Number of 
squares 
shed 
Season of 1924 
Season of 1925 
Age of square 
Pima 
Acala 
Pima 
Acala 
Main 
stalk 
Vege- 
tative 
limbs 
Com- 
plete 
plant 
Main 
stalk 
Vege- 
tative 
limbs 
Com- 
plete 
plant 
Main 
stalk 
Vege- 
tative 
limbs 
Com- 
plete 
plant 
1 day 
1 
1 
2 
14 
10 
14 
10 
13 
13 
9 
16 
13 
14 
13 
14 
11 
8 
13 
8 
3 
8 
10 
6 
1 
3 
3 
.. 
1 
1 
5 
5 
16 
27 
41 
37 
41 
32 
34 
41 
41 
42 
45 
40 
45 
57 
38 
42 
48 
30 
26 
38 
21 
23 
17 
10 
16 
6 
4 
6 

1 
2 
3 
10 
7 
11 
16 
15 
31 
26 
42 
36 
44 
52 
56 
62 
57 
36 
47 
36 
25 
14 
17 
17 
14 
8 
14 
14 
5 
6 

1 
1 
16.9 



3 


3 
5 
2 
4 
4 
3 
7 
11 
14 
12 
8 
12 
11 
9 
5 
3 
11 
6 
3 
7 
5 
1 
5 
4 
2 

2 
18.4 

1 
2 
6 
10 
7 
14 
21 
17 
35 
30 
45 
43 
55 
66 
68 
70 
69 
47 
56 
41 
28 
25 
23 
20 
21 
13 
15 
19 
9 
8 

3 
1 
17.2 
2 
4 
3 
11 
15 
25 
21 
20 
20 
15 
11 
16 
22 
23 
33 
32 
37 
34 
37 
37 
29 
42 
35 
30 
28 
19 
17 
12 
13 
10 

4 
17.3 
1 



2 
2 
2 
3 
6 
5 
2 
3 
13 
12 
11 
17 
16 
13 
12 
10 
9 
12 
12 
10 
10 
9 
9 
4 
13 
4 
1 


1 
19.2 
3 
2 days . . 
4 
5 
14 
25 
27 
27 
27 
22 
21 
28 
32 
26 
32 
26 
32 
43 
27 
34 
35 
22 
23 
30 
11 
17 
16 
7 
13 
6 
3 
5 


1 
15.4 
4 
3 days 
3 
4 days... . 
3 
6 
8 
18 
19 
26 
33 
41 
48 
46 
53 
39 
39 
31 
14 
13 
15 
6 
9 
9 
7 
7 
9 
5 
2 
1 
1 
1 
1 
1 
1 
14.2 
11 
5 days 
17 
6 days _. ... ... . 
27 
7 days . . 
23 
8 days . .... 
23 
9 days 
26 
10 days. 
20 
11 days 
13 
12 days 
19 
13 days 
35 
14 days ... 
35 
15 days. 
44 
16 days ... ... 
49 
17 days . 
53 
18 days 
47 
19 days . . 
49 
20 days 
47 
21 days .. . . 
38 
22 days ..... 
54 
23 days . . 
47 
24 days __ 
40 
25 days 
38 
26 days .. 
28 
27 days... 
26 
28 days 
16 
29 days 
26 
30 days 
14 
31 days 
1 
32 days .. 
4 
33 days 

34 days ... 
14.7 
1 
15.3 
1 
Mean age at which 
squares were shed, 
days ... 
17.8 
As squares of Acala flower about 28 or 29 days after they appear 
and those of Pima flower about 33 days after appearance, the number 
that appear to have been shed a few days before they normally 
would have flowered, in Table 3, is seen to be much higher in the 
Acala than in the Pima. Shedding of normal squares within a few 
days of flowering is relatively infrequent, however, and in most 
cases may be attributed to external injuries, as of insects, wind, or 
cultivation. 
During the recording of data on square shedding each season it 
was observed that the squares on the outermost node of fruiting 
branches of Acala sometimes became stunted or moribund after 
attaining a diameter of several millimeters. These squares were 
carefully watched and either did not increase in size or did so only 
slightly, in relatively long periods, and did not recover from this 
