Dec 1,1925 Leaf-Tissue Fluids of Egyptian Cottons 1033 
The results show that while the Egyptian varieties apparently 
differ among themselves, all of the six varieties here considered 
have a higher osmotic concentration and specific electrical con¬ 
ductivity than the upland varieties (Acala, Meade, and Lone Star) 
with which they have been compared. The two types apparently do 
not differ in the ratio of specific electrical conductivity to freezing- 
point depression. * ° 
All of the Egyptian forms considered have a higher chloride content 
and a lower sulphate content than the upland types. It may be 
recalled in this connection that Balls ( 1) concluded that the salt 
content of leaf tissues is specific in the varieties of cotton grown in 
Egypt. 
It seems probable that differences between the individual varieties 
of the Egyptian type and between the individual varieties of the 
upland type may be demonstrated, but this will require more ex¬ 
tensive and more refined experimentation for final proof. Constants 
for one series of sea-island cotton are given, but since other investiga¬ 
tions on this type are under way the results will not be discussed in 
detail here. 
LITERATURE CITED 
(1) Balls, W. L. 
1914. SPECIFIC SALINITY IN THE CELL SAP OF PURE STRAINS. PrOC. 
Cambridge Phil. Soc. 17: 467-468. 
(2) Gortner, R. A., and Hoffman, W. F. 
1924. QUANTITATIVE ESTIMATION OF CHLORIDES AND SULPHATES IN EX¬ 
PRESSED plant tissue fluids. Bot. Gaz. 77: 96-102. 
. (3) Harris, J. A., Lawrence, Z. W., Hoffman, W. F., Lawrence, J. V., and 
Valentine, A. T. 
1924. THE TISSUE FLUIDS OF EGYPTIAN AND UPLAND COTTONS AND THEIR 
Fi hybrid. Jour. Agr. Research 27: 267-328, illus. 
(4) - Lawrence, J. V., and Lawrence, Z. W. 
1924. THE CHLORID CONTENT OF THE LEAF TISSUE FLUIDS OF EGYPTIAN 
AND UPLAND cotton. Jour. Agr. Research 28: 695-704. 
(5) - Hoffman, W. F., and Lawrence, J. V. 
1925. DIFFERENTIAL ABSORPTION OF ANIONS BY VARIETIES OF COTTON. 
Proc. Soc. Expt. Biol, and Med. 22: 350-352. 
( 6 ) - 
1925. THE ACCUMULATION OF CHLORIDES IN THE LEAF TISSUE FLUIDS OF 
EGYPTIAN COTTON WITH THE MARCH OF THE SEASON. PrOC. SOC. 
Expt. Biol, and Med. 22: 415-417. 
(7) -Hoffman, W. F., and Hoffman, C. T. 
THE SULPHATE CONTENT OF LEAF TISSUE FLUIDS OF EGYPTIAN AND UPLAND 
cotton. Jour. Agr. Research 31: 653-662. 
(8) Kearney, T. H. 
1914. mutation in Egyptian cotton. Jour. Agr. Research 2: 287-302, 
illus. 
(9) - 
1921. HERITABLE VARIATIONS IN AN APPARENTLY UNIFORM VARIETY OF 
cotton. Jour. Agr. Research 21: 227-242, illus. 
( 10 ) - 
1923. SELF-FERTILIZATION AND CROSS-FERTILIZATION IN PIMA COTTON. 
U. S. Dept. Agr. Bui. 1134, 68 p., illus. 
1923. SEGREGATION AND CORRELATION OF CHARACTERS IN AN UPLAND- 
egyptian cotton hybrid. U. S. Dept. Agr., Bui. 1164, 57 p., 
illus. 
(12) Lawrence, J. V., and Harris, J. A. 
1924. TESTS OF A WET OXIDATION AND MODIFIED VOLHARD METHOD FOR 
THE DETERMINATION OF CHLORIDES IN PLANT TISSUE FLUIDS. 
Jour. Amer. Chem. Soc. 46: 1471-1477. 
76649—26f-3 
