CONTENTS 



Fag* 



Department Bulletin No. 1319. — Ginning Pima Cotton in Arizona — 

 Continued. 



Normal equipment and operation — Continued. 



Removing the cotton from the roller 9 



Moving the lint cotton from the gin stands to the press 10 



Keeping the lint clean 10 



Conclusions 10 



Department Bulletin No. 1320. — Behavior of Cotton Planted at 

 Different Dates in Weevil-Control Experiments in Texas and 

 South Carolina: 



Introdution 1 



Soil, climatic, and weevil conditions at San Antonio, Tex 2 



Comparison of successive adjacent plantings at San Antonio- 3 



Yields from successive plantings at San Antonio 19 



Percentage of 5-lock bolls on early and late plantings at San Antonio. _ 22 



A separate late planting at San Antonio 23 



Yields from cotton experiments at San Antonio 28 



Soil, climatic, and weevil conditions at Charleston, S. C 29 



Comparison of successive adjacent plantings at Charleston 30 



Yields from successive plantings at Charleston 38 



Adverse conditions at Gainesville, Fla 41 



Summary 41 



Department Bulletin No. 1321. — A Statistical Study of the Rela- 

 tion Between Seed-Ear Characters and Productiveness in 

 Corn : 



Previous investigations 1 



Material and methods 3 



Ear-row plats 3 



Varieties 3 



Variables 4 



Methods of computation 5 



Basis of interpretation 9 



Correlations among the ear characters 10 



Correlations between the ear characters and yield 12 



Coefficients of the zero and first orders 12 



Coefficients of multiple correlation 15 



Discussion 16 



Summary 17 



Literature cited 19 



Department Bulletin No. 1322. — Some Economic Aspects of Farm 

 Ownership. — Trends and Variations in Some Financial Burdens 

 and Benefits of Farm Ownership in the Spring-Wheat Belt 

 During 25 Years. Illustrated from the History of Selected 

 Farms in Cass County, N. Dak., 1896-1920: 



Purpose and scope of inquiry 2 



Long-time average conditions of ownership 3 



Trends in ownership conditions 7 



Deviations from trends in ownership conditions 15 



Anticipations of the future by owners 16 



Adjustments in renting and purchasing farms 22 



Summary 23 



Department Bulletin No. 1323. — Citrus Pectin: 



Purjjo.se of investigation 1 



Results of previous investigations 2 



Methods for determination of pectin 2 



I' sliminary experiments 3 



Methods of extraction 5 



Preparation of concentrated solutions and powdered pectin 8 



Composition of apple, lemon, and orange pectins 12 



Proportion-, of acid, sugar, and citrus pectin necessary to produce 



jellies 12 



How to make citrus jellie and marmalades -- 15 



Sunn iai . 1<> 



Bibliography Hi 



