Feb. 2 ,1934 
Tissue Fluids in Cotton 
3 i 3 
Table XX .—Comparison of percentage difference between Pima Egyptian, Meade and 
Acala Upland cotton, in the first and second series of determinations and for various 
constants, in IQ 21 
Comparison. 
Rows. 
Series or 
collection. 
Freezing- 
point de¬ 
pression, 
A. 
Specific 
electrical 
conduc¬ 
tivity , K. 
Ratio of 
conduc¬ 
tivity to 
depres¬ 
sion, k/A. 
Hydro¬ 
gen-ion 
concen¬ 
tration 
Ph. 
Pima Egyptian from self-fertilized seed 
and Meade Upland from self-fertilized 
seed. 
} - 
First (1)... . 
Second (2).. 
+ 3 - 76 
+ 7- IO 
4 -o. 77 
4-9. 22 
4-o. 25 
4-2.04 
-6. 67 
8. 54 
Diff. (aHx). 
+ 3 - 34 
4-8.45 
4 -i. 79 
-1.87 
Pima Egyptian from bulk seed and 
Meade Upland from bulk seed. 
l 3,7 
1 3,7 
First (1).. .. 
Second (2).. 
4 -o. 42 
4-4- 69 
4-2. 99 
4-8. 19 
4-2. 23 
4 - 3 * 29 
-8. 67 
—4.07 
1 
Diff.(aMx). 
4-4- 27 
4 - 5 . 20 
4 1.06 
4 - 4 * 60 
i 
Pima Egyptian and Meade Upland, 1 
combined series.! 
U, 3 , 5,7 
First (1).. 
Second (2).. 
4-2.12 
4 - 5*91 
4 - 3*40 
4-8. 72 
4 1. 21 
4-2.65 
-7 • 58 
—6. 29 
i 
Diff. (2M1). 
4 - 3 * 79 
4 - 5*32 
4 - 1*44 
4 - 1 . 29 
Pima Egyptian and Acala Upland from 1 
bulk seed.j 
l 2 , 4,6 
f 2,4,6 
First (1).. 
Second (2).. 
4 - 3 * 10 
4-8.31 
4 - 2 . 93 
4 - 8 . 6 o 
—0.37 
4 -o. 22 
—2. 89 
— 2. 75 
Diff. (2M1). 
4 - 5*22 
4 - 5 * 67 
4 -o. 59 
-Ho. 14 
The reasons for the larger differences in the values of freezing-point 
lowering and specific electrical conductivity in the second as compared 
with the first series are difficult to determine. Among the possibilities 
may be mentioned: 
(1) That the greater exactness of the constants in the second series, 
resulting from all the collections of samples having been made by one 
observer, has resulted in more definite differences in the two series. 
(2) That the differentiation here under consideration is dependent 
upon the physiological age of the organism. 
These are questions which await further investigation. 
THE CORRELATION BETWEEN THE FIRST AND THE SECOND SERIES OF 
determinations 
In the preceding discussion we compared the constants for the 
first and second series of measurements. To determine the probable 
errors of the differences between the two series, it was necessary to com¬ 
pute the coefficients of correlation between them by considering the 
homologous samples of the first and second series as the two variables of 
a pair and the number of homologous pairs as N. 
The coefficients measuring the correlation between the determinations 
of the first and second series appear in Table XXI. Here the varieties 
and the rows are arranged as in preceding tables. The headings for A, 
k, k/A, and P H indicate the correlations between the first and second 
series for the values of these constants. The table is broken into three 
sections, the upper for the Pima Egyptian, the second for the Upland, and 
the lower section for the hybrid. 
The correlations between the first and second series of constants must 
be considered from two sides-—first, that of the relative magnitude of 
the coefficients in the two species and their hybrid; second, that of the 
relative magnitude of the correlations between the first and the second 
series of collections for the four physicochemical constants under con¬ 
sideration. 
