704 
Journal of Agricultural Research 
Vol. XXVIII, No. 7 
SUMMARY 
This paper presents the results of a detailed comparison of the chlorid content 
of the leaf tissue fluids of Egyptian and Upland cotton. 
Several hundred determinations based on an American Egyptian variety, 
Pima, grown in comparison with one or more of the Upland varieties, Acala, 
Meade, and Lone Star, show that almost without exception the chlorid content 
is higher in the tissue fluids of the Egyptian than in those of Upland cottons. 
The means for seven series of determinations show the chlorid content of the 
Egyptian type to be from 28 to 189 per cent higher than that of the Upland type. 
This is clearly one of the factors in determining the higher osmotic concentra¬ 
tion and specific electrical conductivity demonstrated in an earlier paper (5) on 
the tissue fluids of two of these varieties. 
The higher chlorid content may indicate a greater capacity of the Egyptian 
type for growth on saline land. 
LITERATURE CITED 
(1) Balls, W. L. 
1914. A NOTE ON LEAF-FALL AS A CAUSE OF SOIL DETERIORATION. PrOC. 
Cambridge Phil. Soc. 17: 466. 
( 2 ) - 
1914. SPECIFIC SALINITY IN THE CELL SAP OF PURE STRAINS. PrOC. 
Cambridge Pkil. Soc. 17: 467, 468. 
(3) Harris, J. A. 
1920. PRACTICAL UNIVERSALITY OF FIELD HETEROGENEITY AS A FACTOR 
influencing plot yields. Jour. Agr. Research, 19: 279-314. 
Literature cited, 313, 314. 
(4) - an( i Scofield, C. S. 
1920. PERMANENCE OF DIFFERENCES IN THE PLOTS OF AN EXPERIMENTAL 
field. Jour. Agr. Research, 20: 335-356. Literature cited, 356. 
( 5 ) - an d others. 
1924. THE TISSUE FLUIDS OF EGYPTIAN AND UPLAND COTTONS AND THEIR 
f 2 hybrid. Jour. Agr. Research 27: 267-328, 1 pi. Literature 
cited, 325-327. 
(6) Kearney, T. H. 
1913. EGYPTIAN COTTON AS AFFECTED BY SOIL VARIATIONS. U. S. Dept. 
Agr. Bur. Plant Indus. Circ. 112: 17-24. 
(7) - and Means, Thomas H. 
1903. CROPS USED IN THE RECLAMATION OF ALKALI LANDS IN EGYPT. U. 
S. Dept. Agr. Yearbook, 1902, p. 573-588, pi. 78-81. 
(8) Lawrence, J. V., and Harris, J. A. 
1924. TESTS OF A WET OXIDATION AND MODIFIED VOLHARD METHOD FOR 
THE DETERMINATION OF CHLORIDS IN PLANT TISSUE FLUIDS. 
Jour. Amer. Chem. Soc. 46: 1471-1477. 
