46 BULLETIN 1467, U. S. DEPARTMENT OF AGRICULTURE 
a one-variety basis and should not be invoked to coerce mixed- 
variety communities into one-variety production. 
That it is possible for entire communities to unite in the produc- 
tion of one variety of cotton has been amply demonstrated by the 
establishment of one- variety Acala communities in California. That 
the establishment of such communities is worth while has also been 
demonstrated by the benefits received. That the establishment of 
such communities is of great benefit to other cotton-growing dis- 
tricts is evident from the extension of the Acala variety through the 
seed made available by the Coachella Valley Acala community. Of 
the 483,000 acres of cotton grown in 1925, in California, Arizona, 
and the Imperial Valley, Lower California, Mexico, 322,100 acres 
were of the Acala variety. The Acala seed used in planting this 
entire acreage, with the exception of the San Joaquin Valley of 
California, originated from seed distributed by the association rep- 
resenting the Coachella Valley Acala community during the period 
1921 to 1925. 
LIST OF PUBLICATIONS ON COMMUNITY COTTON IMPROVEMENT 
The following list includes publications issued by the Depart- 
ment of Agriculture and a few other papers that treat of the im- 
provement of the cotton industry through community organization, 
in order to utilize superior varieties and maintain pure seed sup- 
plies. 
Cotton Selection on the Farm by the Characters of the Stalks, Leaves, 
and Bolls. By O. F. Cook. Bur. Plant Ind. Circ. 66. 1910. 
Cotton Improvement on a Community Basis. By O. F. Cook. Yearbook 
of the U. S. Dept. of Agriculture for 1911, pp. 397^10. (See also Report of 
the Chief of the Bur. Plant Ind. for 1911, p. 24.) 
Selection of Cotton and Corn Seed on Southern Farms. By S. A. Knapp 
and J. A. Evans. Bur. Plant Ind. Doc. 747. (Farmers' Cooperative Demon- 
stration Work A-67.) 1912. 
Factors Affecting the Production of Long-Staple Cotton. By O. F. Cook, 
Bur. Plant Ind. Circ. 123, pp. 3-9. 1913. 
Cotton Problems in Louisiana. By Oi F. Cook. Bur. Plant Ind. Circ. 130, 
pp. 3-14. 1913. 
The Relation of Cotton Buying to Cotton Growing. By O. F. Cook. U. S. 
Dept. Agr. Bui. 60. 1914. 
Custom Ginning as a Factor in Cotton-Seed Deterioration. By D. A. 
Saunders and P. V. Cardon. U. S. Dept. Agr. Bui. 288. 1915. 
Community Production of Durango Cotton in the Imperial Valley. Bv 
Argyle McLachlan. U. S. Dept. Agr. Bui. 324. 1915. 
Community Production of Egyptian Cotton in the United States. By C. S. 
Scofield. T. H. Kearney, C. J. Brand. O. F. Cook, and W. T. Swingle. U. S. 
Dept. Agr. Bui. 332. 1916. 
Tests of Pima Egyptian Cotton in the &alt River Valley, Arizona. By 
T. H. Kearney. U. S. Dept. Agr., A. & D. R. P. Circ. 1. 1916. 
Extension of Cotton Production in California. Bv O. F. Cook. U S. 
Dept. Agr. Bui. 533. 1917. 
Production of American Egyptian Cotton. By C. S. Scofield, T. H. Kearney. 
C. J. Brand, O. F. Cook, and W. T. Swingle. U. S. Dept. Agr. Bui. 742. 1919. 
Cotton Improvement under Weevil Conditions. By O. F. Cook. U. S. Dept. 
Agr., Farmers' Bui. 501 (revised). 1924. 
Cotton a Community Crop. By O. F. Cook. Jour. Heredity, vol. 11. pp. 
174-177. April, 1920. 
Commercial Parasitism in the Cotton Industry. By O. F. Cook. Nature 
(London), vol. 105, pp. 548-549. July 1, 1920. 
Community Cotton Improvement in North Carolina. By R. Y. Winters, 
S. W. Hill and P. H. Kime. N. C. Agr. Ext. Ser. Circ. 108. 1920. ' 
