Dec. 1,1925 
Leaf-Tissue Fluids of Egyptian Cottons 
1029 
The average values of osmotic concentration, as expressed in terms 
of freezing-point depression (A) in the various series or determinations 
made in the two years, are set forth in Table I. In the experiment 
of 1922, in both the first and the second series of determinations, all 
six of the Egyptian cottons show a greater freezing-point depression 
than the single variety (Meade) of Upland cotton. 
Table I .—Comparison of osmotic concentration in terms of freezing-point depres¬ 
sion (A) in Egyptian, Sea-Island, and Upland cotton, as grown at Sacaton, Ariz., 
in 1922 and 1924 ( E 1 -E 5 are field key letters) 
Variety 
Determinations 
in 1922 
made 
Determinations made in 1924 
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 
1.275 
8 
1.285 
8 
1.233 
8 
1.166 
12 
1.243 
14 
1.230 
Zagora, E2 _ 
8 
1.298 
8 
1.291 
8 
1.238 
8 
1.134 
12 
1.240 
14 
1.215 
Sakel, E3_ 
8 
1.345 
8 
1.378 
8 
1.371 
8 
1.374 
12 
1.379 
15 
1.444 
Pelion, E4 _ 
8 
1.338 
8 
1. 335 
8 
1.309 
8 
1.274 
12 
1.349 
13 
1.314 
Assili, E5 _ 
8 
1.274 
8 
1.396 
8 
1.311 
8 
1.314 
12 
1.368 
15 
1.430 
Pima__ 
8 
1.380 
8 
1. 417 
8 
1.267 
8 
1.300 
11 
1.261 
13 
1.353 
Sea island_ _ 
8 
1.151 
8 
1.134 
8 
1.151 
11 
1.152 
Upland: 
Acala _ 
8 
1.112 
8 
1.061 
8 
1.112 
11 
1.078 
Meade__ 
8 
1. 251 
8 
1. 247 
8 
1.147 
8 
1.086 
8 
1.147 
11 
1.146 
Lone Star_ 
7 
1.106 
8 
1.037 
7 
1.106 
11 
1.102 
In the series of determinations carried out in 1924 the averages 
based on the partial series and the entire series of determinations 
must be considered separately. In both the first and second partial 
series the freezing-point depression is higher in each of the six 
Egyptian varieties than in any one of the three different Upland 
varieties (Acala, Meade, and Lone Star). 
In only one instance is the freezing-point depression of an Egyptian 
variety as low as that of Sea-Island cotton. 
In both the first and the second whole series the averages of each 
of the six Egyptian varieties are numerically higher than those for 
the Upland varieties or for the Sea-Island cotton. 
While the Egyptian varieties differ to some extent among them¬ 
selves, taken as a class they are all characterized by distinctly higher 
osmotic concentration than the Upland varieties with which they 
are compared. These results show that higher osmotic concentra¬ 
tion is not a peculiarity of the American Egyptian variety, Pima, 
but that it is characteristic of Egyptian varieties in general. 
The experiments are not sufficiently extensive to justify final 
conclusions concerning the relative values of osmotic concentration 
in the Egyptian varieties themselves. It appears, however, that 
Ashmuni and Zagora have lower osmotic concentrations than the 
other four types, although in the first series of determinations Assili 
has about the same average freezing-point depression as the two 
just mentioned. 
