338 EXPERIMENT STATION RECORD. 



a green manure the yield increased more than twice. Alfalfa did not act so 

 favorably. The .stems of the cotton plant proved to be a valuable fertilizer, the 

 yield more than doubling. 



The handling and marketing of the Arizona-Egyptian cotton of the Salt 

 Biver VaUey, J. G. Maktin (U. S. Dept. Agr. Bui. Sll (1915), p. 16, pis. S).— 

 This bulletin records results of investigations in 1913 and 1914 to discover the 

 effect of proper and improper handling of Egj-ptian cotton in the Salt River 

 Valley from the time it was picked until it was loaded into cars preparatory 

 to its departure for the mills. The topics discussed include the necessity for 

 clean picking, storage of seed cotton, ginning the Arizona-Egyptian cotton, 

 sampling cotton at gin stands, baling and covering the cotton, advisability 

 of gin compression, tagging, marking, branding, and weighing the cotton, storage 

 of ginned Egjptian cotton, classing the Arizona-Egyptian cotton, staple lengths, 

 tables of classification, advantages of grading cotton, and marketing of Arizona- 

 Egyptian cotton. 



The Arizona grades given to the cotton as a result of this study, and which 

 corre.spond to the official cotton standards of the United States are fancy, extra, 

 choice, standard, and medium. 



From the results the following conclusions are drawn : " The increase in the 

 estimated size of the Salt River Valley Egyptian cotton crop from 280 bales 

 in 1912 to 2,200 bales in 1913, and to 6,187 in 1914. demonstrates tlie peculiar 

 fitness of this locality for the production of Egjptian cotton. The continued 

 Improvements in methods of handling and equipment will serve to improve 

 the grade of the product, while the classing of the cotton will tend to secure 

 a more stable market at better and more uniform prices. Up to the present 

 time the relatively small crop from the Salt River Valley has been so distrib- 

 uted that only a few spinners have been able to test this cotton. The testi- 

 mony from a number of various sources, including some of the largest cotton 

 firms, spinners, and exporters, intlicates that the quality, character, and length 

 of staple of this cotton is of such a nature as will establish for it a permanent 

 market." 



Results of selection of seed tubers in potato culture, Ci.auskn (Jour. 

 Landw., 63 (1915), No. 1, pp. 1S2. fig. 1; ahs. in Gartctiflnrn, 6^ (1915), Nos. 

 11-12, pp. 187-192; IS-H, pp. 220-224).— This article describes the work, 

 presents data, and gives the results of selection of seed tubers carried on at 

 Heide, in Holstein, Prussia, since 1908. Three varieties were used in this work, 

 namely. Six Weeks, Egg, and Up-to-Date, and line .selection was carefully fol- 

 lowed in each experiment in order to eliminate any factors that a heterogeneous 

 parentage might introduce. The author has drawn the following conclusions 

 from the data obtained : 



The yield increases with the increase in size of the seed tuber. Early vari- 

 eties respond to the selection of heavy seed tubers better than late varieties. 

 Heavy seed tubers have a greater value on thin or unfertilizo<l soil than on rich 

 soil. The larger the seed tuhor the smaller will be the yield per unit weight 

 of seed. Increasing the size of the seed tuber increa.ses the number of tubers in 

 the yield. The selection of large seed tubers did not lead to an increase in the 

 size of the tubers in the offspring. The inheritance of tuber numbers vanishes 

 when all tubers are planted, but is evident when seed tubers of equal size from 

 different mother plants are coraparetl in their productivity. Two tubers or 

 pieces of tubers planted in the same hill did not yield as much as did seed 

 planted .singly but occupying the same soil area. 



The relation of moisture to yield of winter wheat in western Kansas, L. E. 

 Call and A. L. Hallstkd (Kansas Sta. Bui. 206 (1915), pp. S4, figs. /2).— This 



