191»] FIELD CHOPS. 335 



under conditions similar to those which prevail where seed is selected from the 

 crib in the spring. The average germination and yield of those i<>t.s receiving 



no heat was 03.77 per cent and 7u. ii' i»u., respectively, as compared with 0G.8 

 per cent germination and 7-t.L'l hu. Cor those lots i<> which heat was applied In 

 some way. With the abnormal weather conditions of 1918, germination varied 

 from 1 per cent for seed stored in the crib to 95.07 per cent for that bung up in 

 the furnace room. 



Cotton variety tests for 1917, R. Y. Winters and V. Et. Herman (i:»l. 

 v. C. Dept, Agr., 39 (1918), No. 3, pp. 10).— This reports the results of tests 

 with 38 short-staple and G long-staple varieties of cotton at West Raleigh, 



The highest yielding short-staple varieties were Jones Improved, Cook Im- 

 proved, and Wannamaker Cleveland, with yields of lint amounting to 351, 349, 

 and 330.4 lbs. per acre, respectively. Hartsville No. 12 and Webber No. 82, with 

 yields of 207 and 210.S lbs. of lint per acre, were the highest yielding long- 

 staple types. 



Note on protecting the cotton flowers from natural crossing, G. L. Kottub 

 (I'oona Agr. Col. Mag., 9 (191S), No. 3, pp. 131, 132, figs. 3).— A simple method 

 for the prevention of cross-pollination In cotton is described. 



Rings made of thin wire were employed in place of paper bags, the rings being 

 slipped over the fully developed buds before they began to open. The protected 

 tlower was marked by a cotton thread attached to the stalk and ring. 



Cotton culture, W. E. Packard (Mo. Bui. Cal. Com. Hort., 7 (191 S), No. 4, 

 pp. 181-187). — The production of cotton in southern California is described 

 with particular reference to the San Joaquin, Sacramento, Imperial, and Palo 

 Verde Valleys. The cost of production of three varieties has been estimated 

 as follows: For picking, Mebane Triumph $15 per bale, Durango $20.80, and 

 yptlan $40.62; for ginning, $4.50, $4.50, and $14 per bale, respectively; and 

 for the total cost of production on a basis of one bale per acre. Mebane Triumph 

 from $48.80 to $71.85, Durango from $54.G0 to $77.65, and Egyptian from $S3.92 

 to $106.97. 



The cost of cotton production, season of 1917-18 (New York: U. F. Bach- 

 man & Co., 1918, pp. 27). — This presents a statistical study of factors entering 

 into the actual cost of producing cotton during the season of 1917. It is esti- 

 mated that the average cost of production was 11.2S cts. per pound ; the average 

 price obtained by farmers, 27.5 cts. per pound ; and the average net profit, $31.55 

 per acre. 



Extracts from letters from several directors of experiment stations in the 

 cotton States relative to a possible correlation of the potash scarcity and the 

 small yield of the last year are given, from which it is concluded that very little, 

 if any, reduction in yield was attributable to a lack of potash except on certain 

 sandy soils of the Southeast. 



The world's cotton shortage, J. A. Todd (African World. 59 (1917). Nos. 765, 

 pp. V, VI; 769, p. V; Agr. Jour. India, 13 (1918), No. 1. pp. 110-120) .—This 

 presents an economic discussion of the present status of the cotton industry 

 throughout the world, with special reference to the bearing upon the situation 

 of cotton production in Egypt. While Egyptian cotton represents only about 

 6 per cent of the world's total, it Is said to have the highest yield per acre, 450 

 lbs. of lint cotton, to supply S5 per cent of the second and 73 per cent of the 

 third of the five recognized grades, and to have a value of from 50 to 100 per 

 cent above that of American middling. 



Potato culture in Maine, E. L. Newdtck and W. J. Morse (Bui. [Maine] 

 Dept. Agr., 17 (1918), No. 1. pp. H+40. fig. 1).—A general discussion of the 

 production, harvesting, and marketing of potatoes in Maine is given by E. L. 



