8 
BULLETIN 1365, U. S. DEPARTMENT OF AGRICULTURE 
Table 4. — Periods of development of squares on specific nodes of fruiting branches 
of Pima and Acala cotton, averaged in groups of 10 days each in June, July, 
and August, 1924- and 1925 
Fruiting 
branch 
node 
Pima 
Acala 
Season and 10-day interval, based on 
appearance of squares 
Number 
of 
squares 
Average 
square period 
(days) 
Number 
of 
squares 
Average 
square period 
(days) 
Season of 1924: 
fl 
29 
14 
30. 655±0. 278 
29. 286± . 250 
21 
17 
5 
9 
3 
26. 000±0. 346 
June 16 to 25 
•2 
3 
26.942± .329 
26. 200± .352 
fl 
46 
14 
7 
3 
69 
49 
25 
10 
63 
41 
24 
14 
41 
33 
24 
25 
40 
34 
24 
32 
76 
55 
24 
3 
66 
55 
43 
25 
60 
61 
41 
40 
42 
27 
24 
28 
47 
30 
22 
24 
33 
19 
10 
18 
8 
8 
33. 478± . 107 
32. 500± . 518 
33. 286± . 220 
36. 000=bl. 457 
31. 826± . 068 
31. 633± . Ill 
32. 240± . 122 
32. 400± . 141 
33. 492± . 110 
32. 585± . 132 
33. 833± . 227 
34. 429± . 289 
34. 976i . 144 
33. 818± . 117 
35. 000± .245 
34.840± .218 
33'. 675± . 173 
33. 147± . 119 
33. 625d= . 213 
34. 781± • 238 
31. 618± . 087 
31. 273± . 133 
32. 500± . 224 
34. 333± . 767 
32. 273± . 093 
32. 382± . 120 
33. 512=k - 188 
33. 240± . 139 
32. 100=b . 120 
30. 869d= . 112 
31. 902± . 151 
32. 550± . 213 
34. 048± . 200 
33. 259± . 305 
35. 417=fc . 377 
38. 679=b . 541 
35. 191± . 361 
33. 200± . 169 
35. 455± . 377 
36. 583± . 351 
35. 061± . 220 
33. 526± . 290 
35. 800± . 186 
35. 611± . 564 
34.375± .290 
33.250± .409 
28. 444± .463 
2 
26. 333± . 662 
13 
4 to last.. . 
1 
9 
7 
12 
3 
24 
13 
12 
11 
15 
8 
9 
6 
27. 556± .283 
2 
27. 714± . 590 
July 6 to 15 
|3 
4 to last... 
1 
29. 000± . 841 
27. 833± . 171 
2 
27. 615± .227 
July 16 to 25 
13 
4 to last... 
fl 
28. 000=b . 324 
31. 600± .776 
2 
29. 875± .325 
July 26 to August 4 . 
3 
4 to last.. . 
fl 
29. 500± . 742 
2 
13 
4tolast-_- 
fl 
Season of 1925: 
65 
55 
45 
8 
68 
76 
70 
45 
49 
45 
46 
23 
43 
37 
29 
28 
25 
20 
16 
16 
12 
15 
8 
12 
26.923± .086 
2 
26.709± .109 
June 8 to 17 . 
13 
4 to last... 
fl 
27. 625± . 237 
27. 956± . 115 
2 
27. 645± . 089 
June 18 to 27 
28. 057 ± . 098 
28. 244± . 118 
29. 184± . 161 
13 
[4 to last-. . 
fl 
June 28 to July 7 
2 
28. 467± . 154 
29. 043± . 168 
29. 130± . 167 
31. 837± . 373 
13 
U"to~'Iast": 
fl 
J2 
30.973± .309 
July 8 to 17 
13 
1 4 to last... 
fl 
32. 679± . 407 
32.400± .232 
12 
32.700± .317 
July 18 to 27 
13 
U to last... 
fl.. 
33. 812± . 401 
32. 083± . 351 
2 
31.867± .304 
Julv 28 to August 6 
3 
U to last... 
/I 
33. 083± . 257 
August 7 to 16.. 
\2... 
In 1925 significantly longer periods on the outer nodes are shown 
in the Pima for node 4 compared with nodes 1 and 2 in the interval 
from June 8 to 17; for nodes 3 and 4, respectively, compared with 
nodes 1 and 2 in the interval from June 18 to 27; for nodes 3 and 4, 
respectively, compared with node 2 in the interval from June 28 
to July 7; for node 3 compared with node 2 and for node 4 compared 
with nodes 1, 2, and 3 in the interval from July 8 to 17; for nodes 
3 and 4, respectively, compared with node 2 in the interval from 
July 18 to 27; and for node 4 compared with node 2 in the interval 
from July 28 to August 6. 
No significantly longer periods for squares on outer nodes appear 
in the Acala in 1924 in Table 4, as fewer squares with more widely 
varying periods than in the Pima were available for consideration, 
