May 17,1924 Leaf Tissue Fluids of Egyptian and Upland Cotton 
70S 
content is not discussed in this place. The probable errors of the differences have 
been calculated with due regard to the correlation between associated plants by 
the formula given above. 
In all comparisons the average chlorid content of the Egyptian cotton is 
higher than that of the associated Upland plants. The differences are many 
times as large as their probable errors and are unquestionably significant. 
Table VII.—Mean chlorid content {in terms of grams of Cl per liter) of tissue 
fluids of Egyptian and Upland cotton as grown at Sacaton, Ariz., in 1922-23 
N 
Difference between Egyptian 
and Upland cotton 
Num¬ 
ber 
of 
analy¬ 
ses 
Mean chlorid 
content for 
Egyptian 
cotton 
Mean chlorid 
content for 
Upland cotton 
Absolute 
difference and 
probable error 
Ratio 
of ab¬ 
solute 
differ¬ 
ence to 
prob¬ 
able 
error 
Per¬ 
cent¬ 
age 
differ¬ 
ence 
First comparison of Pima Egyp¬ 
tian and Meade and Acala Up¬ 
land cotton, 1922 (B): 
First series, July 25 to Aug. 
9— 
Comparison of Pima and 
Meade. 
67 
4.7388±0.0642 
3.1082^0.0538 
1.6306db0.0488 
33.4 
52.6 
Comparison of Pima and 
Acala... 
69 
4.7355± . 0626 
3.6848± . 0446 
1.0507± . 0457 
23.0 
28.6 
Second series, Aug. 28 to 
Sept. 4— 
Comparison of Pima and 
Meade.. 
67 
5.2276db . 0676 
2.7799± . 0514 
2.4478± . 0550 
44.5 
88.1 
Comparison of Pima and 
Acala... 
68 
5.2352± . 0647 
3.4522=t . 0501 
1.7831=4= . 0528 
33.8 
51.7 
Second comparison of Pima 
Egyptian and Meade Upland, 
1922 (C): First series, Aug. 21 
to Aug. 27—Comparison of Pi¬ 
ma and Meade.... 
47 
7.8862± . 1266 
4. 2670d= .1120 
3.6191± . 1183 
30.6 
84.8 
Comparison of Pima Egyptian 
and Lone Star Upland cotton, 
1923 (C): ! 
First series. July 29 to Aug. i 
14—Comparison of Pima 
and Lone Star.j 
i 
| 
68 1 
S 
j 
2. 4412± . 0406 
j 
1. 0515± . 0239 ! 
1.3897=1= .0396 
35.1 
132,2 
Second series, Aug. 18 to 
Aug. 31—Comparison of j 
Pima and Lone Star.J 
i 
1 
1 
68 
i 
3. 308S± . 0477 
i 
i 
1.1434± . 0302 ! 
i 
2.1654Jr . 0520 
41.7 
189.4 
When the differences are expressed in percentages of the chlorid content of the 
Upland type instead of in terms of grams of chlorid (as Cl) per liter of tissue fluid, 
the true significance of the differentiation with respect to chlorid content becomes 
fully apparent. The Egyptian cotton is from 28.5 to 189.4 per cent richer in 
chlorids than the Upland cotton grown as a control. 
The causes of these variations in the differences from culture to culture must be 
a subject for further investigation. In passing we may note that in the com¬ 
parison involving Pima Egyptian and both Meade and Acala Upland cottons the 
difference between Pima and Meade is greater than that between Pima and Acala 
in both the first and second series of determinations. We may also point to the 
fact that in both cultures in which two series of determinations were made the 
differentiation of the Egyptian and the Upland types is greater in the series of 
analyses made later in the season. Both of these problems will receive more 
detailed consideration later. 
