1030 
Journal of Agricultural Research 
Vol XXXI, No. 11 
Turning now to the values of specific electrical conductivity as 
expressed in reciprocal ohms, we have the constants set forth in 
Table II. In all 12 comparisons which may be based upon the 
series of determinations made in 1922, the value of k for the Egyptian 
type is higher than that for the single variety of the Upland type. 
In 1924 the same result is found for the comparison between the 
six Egyptian and the three upland types. Thus there can be no 
question that while the Egyptian varieties differ to some extent 
among themselves, they are, so far as investigated, characterized by 
higher specific electrical conductivity than the Upland types which 
have been grown under similar conditions in the investigations which 
have hitherto been possible. 
Table II .—Comparison of specific electrical conductivity (k) in Egyptian , Sea~ 
Island, and Upland cotton, as grown at Sacaton, Ariz., in 1922 and 1924 
Determinations made in 
1922 
Determinations made in 1924 
Variety 
First series, 
Aug. 10 to 
Aug. 13 
Second 
series, Aug. 
17 to Aug. 20 
First 
partial 
series 
Second 
partial 
series 
First 
whole 
series 
Second 
whole 
series 
N 
Mean 
N 
Mean 
N 
Mean 
N 
Mean 
N 
Mean 
N 
Mean 
Egyptian: 
Ashmuni, Ei_ 
8 
0.03282 
8 
0.03212 
8 
0.02949 
8 
0.02871 
12 
0.02936 
14 
0.02960 
Zagora,E 2 _ 
8 
. 03255 
8 
. 03170 
8 
. 02977 
8 
. 02776 
12 
.02970 
14 
. 02878. 
Sakel, E 3 _ 
8 
.03364 
8 
. 03319 
8 
.03085 
8 
.03170 
12 
. 03139 
15 
. 03226. 
Pelion, E 4 __ 
8 
. 03463 
8 
. 03307 
8 
. 03149 
8 
.03135 
12 
. 03223 
13 
.03231 
Assili, Es_ __ 
8 
.03288 
8 
.03199 
8 
.03000 
8 
. 03070 
12 
.03109 
15 
.03208. 
Pima.. _ _ 
8 
. 03449 
8 
. 03339 
8 
.02948 
8 
.02991 
11 
.02878 
13 
. 03034 
Sea island _,__ 
8 
.02647 
8 
.02750 
8 
.02647 
11 
. 02782: 
Upland: 
Acala 
7 
.02601 
8 
.02445 
7 
. 02601 
11 
. 02562: 
Meade_ 
8 
. 03163 
8 
.03066 
8 
. 02734 
8 
. 02539 
8 
. 02734 
11 
. 02610 
Lone Star 
8 
. 02511 
8 
.02431 
8 
. 02511 
11 
. 02417- 
In both the first and second series of determinations of 1924, as. 
epitomized in the averages for both the partial and the entire series, 
specific electrical conductivity for the Sea-Island cotton is lower than 
that of any of the Egyptian varieties. It may be higher or lower 
than that of the associated Upland cultures. 
We now consider the ratio of specific electrical conductivity to* 
freezing-point depression, k/A. The averages are given in Table III. 
For the first series of determinations the average ratio for the six 
different Egyptian varieties is identical with that for the Upland typo 
in so far as can be determined by the examination of averages not. 
provided with probable errors. This result is in . accord with the* 
findings of an earlier investigation ( 3 ) on Pima Egyptian and Meade* 
and Acala Upland cotton, in which the conclusion was drawn that 
there is no certain differentiation of the two types with respect to 
the ratio k/ A. 
We now have to consider the concentration of two anions, for 
which absorption has been shown to be differential ( 5). 
The results of an earlier investigation {f) have shown conclusively^ 
that Pima Egyptian cotton differs from Meade, Acala, and Lone: 
Star Upland cotton in the chloride content of its leaf-tissue fluids. 
