May i 7 ,1924 Leaf Tissue Fluids of Egyptian and Upland Cotton 
701 
Leaving this point for the moment and considering merely the relative 
amounts of chlorids in the two types of cotton, we may note that if the chlorid 
content of the two varieties were sensibly the same, the frequencies corresponding 
to given values of chlorid content in the two forms under consideration should be 
distributed at random about the “diagonal cell”—i. e., the line of cells corre¬ 
sponding to identical valueaon the scales of chlorid content for the Egyptian and 
the Upland varieties under comparison, of these tables. Thus the heavy bars 
mark off the chlorid content which the Upland cottons would have had if they 
had been as rich in chlorids as the Egyptian form. 
The fact that without exception in the illustrative table, and almost without 
exception in the unpublished tables for the other series the chlorid content of the 
Upland forms lies below the diagonal cell which indicates equal chlorid content in 
the two forms, shows how conspicuously and definitely the Egyptian and Upland 
types are differentiated with respect to their content of this anion. 
From such a table of double entry the differences in the chlorid contents of 
the associated Egyptian and Upland plants may be readily determined. This 
has been done for the comparison between Pima and Meade and Pima and 
Acala cultures in 1922 and for Pima and Lone Star cultures grown in 1923. The 
results are set forth in Table V. These entries show that practically without 
exception the individual comparisons show a higher chlorid content in the Egyp¬ 
tian than in the Upland cotton plants. 
Table V.— Differences in chlorid content (grams per liter in 0.25 gm. class ) of leaf 
tissue fluids of associated Egyptian and Upland cotton plants 
Difference 
in chlorid 
content 
(Egyptian 
less Upland) 
Pima Egyp¬ 
tian and 
Meade 
Upland 
Pima Egyp¬ 
tian and 
Acala 
Upland 
Pima Egyp¬ 
tian and 
Lone Star 
Upland 
Difference 
in chlorid 
content 
(Egyptian 
less Upland) 
Pima Egyp¬ 
tian and 
Meade 
Upland 
Pima Egyp¬ 
tian and 
Acala 
Upland 
Pima Egyp¬ 
tian and 
Lone Star 
Upland 
First 
series 
Sec¬ 
ond 
series 
First 
series 
Sec¬ 
ond 
series 
First 
series 
Sec¬ 
ond 
series 
First 
series 
Sec¬ 
ond 
series 
First 
series 
Sec¬ 
ond 
series 
First 
series 
Sec¬ 
ond 
series 
-0.60 
1 
+2.25 
4 
12 
1 
15 
3 
9 
-0.25 
+2.50 
1 
9 
1 
4 
3 
11 
0.00 
1 
1 
+2.75 
7 
2 
6 
+0.25 
1 
8 
+3.00 
1 
5 
3 
+0.50 
4 
9 
2 
3 
+3.25 
4 
2 
4 
+0.75 
4 
14 
6 
1 
+3.50 
7 
1 
+1.00 
11 
1 
9 
3 
15 
2 
+3.75 
1 
+1.25 
10 
2 
12 
6 
7 
3 
+4.00 
1 
+1.50 
13 
2 
4 
15 
19 
9 
! 
i . 
+1.75 
8 
7 
5 
8 
8 
9 
67 
67 
! 69 
68 
68 
68 
+2.00 
11 
10 
6 
9 
4 
9 
I 
i 
As noted above, there is an evident tendency for the variable chlorid content of 
the Upland plants to be larger when associated with Egyptian plants of a higher 
class of chlorid content. This is more strikingly evident in some of the unpub¬ 
lished tables than in the illustrative one given (Table IV). This may be most 
readily explained as due to both Egyptian and Upland plants being influenced in 
the same manner by external conditions, presumably in this case by variation 
of chlorid concentration in the soil. Thus we have a further illustration of 
substratum heterogeneity as a factor influencing the behavior of plants in field 
plots (S, 4). 
96037—24f-8 
