May i 7 ,1924 Leaf Tissue Fluids of Egyptian and Upland Cotton 
699 
Table III.— -Frequency distribution of chlorid content (in terms of grams of Cl per 
liter of fluid) in leaf tissue fluids of Egyptian and Upland cotton as grown at 
Sacaton , Arizin 1922 
Grams of chlorid 
(in terms of Cl) 
per liter 
Frequencies 
for samples taken 
Aug. 21 to Aug. 27 
Grams of chlorid 
(in terms of Cl) 
per liter 
Frequencies 
for samples taken 
Aug. 21 to Aug. 27 
Class range. 
Class 
center 
Pima 
Meade 
Class range. 
Class 
center 
Pima 
Meade 
2. 626—2.976 
2.80 
4 
7.526-7.875 
7.70 
9 
1 
2.976—3.325 
3.15 
7 
7.876—8.225 
8.05 
4 
3.326—3.675 
3.50 
7 
8.226—8.575 
8.40 
7 
3.676—4.025 
3.85 
9 
8.576—8.925 
8.75 
1 
4.026—4.375 
4.20 
3 
8.926—9.275 
9.10 
2 
4.376—4.725 
4.55 
2 
9.276—9.625 
9.45 
1 
4.726—5.075 
4.90 
i 
3 
9.626—9.975 
9.80 
2 
5.076—5.425 
5.25 
2 
5 
9.976-10.325 
10.15 
3 
5.426—5.775 
5.60 
1 
4 
10.326—10.675 
10.50 
5.776-6.125 
5.95 
1 
2 
10.676—11.025 
10.85 
6.126—6.475 
6.30 
2 
11.026—11.375 
11.20 
1 
* 
6. 476—6.825 
6.65 
3 
6. 826—7.175 
7.00 
7 
Totals. 
48 
49 
7.176—7.525 
7.35 
3 
Because of a higher and more variable chlorid content in the smaller comparison 
between Pima and Meade Upland cotton made in 1922 (comparison C, above) 
a wider class value must be used for tabulation. A class range of 0.35 gm. of 
€1 per liter of fluid was therefore adopted. (See Table III.) 
The range of chlorid content in each class and the central values to be used for 
purposes of calculation are indicated in the first two columns (Tables II and III.) 
The frequencies show the numbers of analyses falling in each of the classes in the 
comparisons of Pima Egyptian and Meade and Acala Upland cotton grown in 
1922 and in the comparison of Pima Egyptian and Lone Star Upland cotton 
in 1923. 11 
While these distributions show clearly that the chlorid content of the Upland 
varieties (Acala, Meade, and Lone Star) is lower than that of the Egyptian 
variety (Pima) with which they are compared, the chlorid contents vary con¬ 
siderably from sample to sample. The frequency distributions are transgressive, 
many of the samples of Upland tissue fluids of higher chlorid content exceeding 
the samples of lower chlorid content in the Egyptian cotton in the concentration 
of this ion. It might, therefore, be assumed that the difference between the 
analyses is after all a statistical one, holding in the long run but not demonstrable 
in individual comparisons. An examination of the analyses for the associated 
plants of the two types of cotton shows that this is not the case. 
The relationship between the individual determinations may be best brought 
out by means of arrangement in correlation tables. Such tables have been pre¬ 
pared for each of the series, but because of their essential agreement only one 
(Table IV) will be published. 
n The frequencies given in these tables represent all the available determinations for each of the varieties. 
In some cases determinations for one or more of the varieties of a subplot could not be made; hence the totals 
of these distributions differ among themselves and from those given in the table of differences below (Table 
V) in which only determinations based on plants which occurred in actual association are given. 
