19161 FIELD CROPS. 137 



of 24 varieties in 1915, Double Limbed stood first In the rate of yield of seed- 

 cotton with 2,442 lbs. per acre, in the yield of lint per acre with 810 lbs., in the 

 yield of seed per acre with 1,632 lbs., and in total value of crop per acre with 

 $129.84. The range in percentage of lint of the 24 varieties was from 30 to 39 

 per cent. Cook Improved leading in this respect. In yield of seed cotton per 

 acre the varieties ranged from 1,145 lbs. to 2,442 lbs. 



At the Pee Dee substation, experiments were conducted in 1914 and 1915 to 

 determine the limiting factor or factors of cotton production, and a similar test 

 was conducted with corn. The results secured with both crops given in tables 

 show that for the two sea.sons, nitrogen was the principal limiting factor, but 

 moisture may become the factor which limits the production in some seasons. 



Studies on the cotton plant in Eg'ypt, W. L. Balls (Intemat. Inst. Agr. 

 [Rome], Mo. Bui. Agr. Intel, and Plant Diseases, ^6 {1915), No. 8, pp. 1011-1023, 

 fig. 1). — This article summarizes briefly the work of the author with cotton 

 In Egypt and groups the conclusions arrived at in these studies with reference 

 to agricultural practices, including irrigation, spinning requirements, plant phys- 

 iology, plant breeding, and genetics. A bibliography of 49 references is pre- 

 sented in conclusion. 



Comparative spinning tests of the different grades of Arizona-Egyptian 

 with Sea Island and Sakellaridis Egyptian cottons, F. Taylor and W. S. 

 Dean {U. S. Dept. Agr. Bui. 359 {1916), pp. 20, figs. 2).— A report is presented 

 on spinning tests with the different grades of Arizona-Egyptian cotton compared 

 with each other as to waste, tensile strength, bleaching, mercerization, dyeing, 

 and finishing qualities, and also compared with Sakellaridis Egyptian and Sea 

 Island cottons. The tests were conducted on the 1914 crop and the different 

 lots tested included one bale each of extra, choice, standard, and medium Ari- 

 zona-Egyptian cotton ; three bales of Sakellaridis Egj'ptian cotton of the grades 

 good, fully good fair, and fair ; and two bales of Sea Island cotton of the grades 

 fancy and extra choice. The results are given in tables and are briefly discussed. 



The relative waste of the four grades of Arizona-Egj'ptian cotton was as fol- 

 lows : Extra 17.69 per cent, choice 18.56 per cent, standard 20 per cent, and me- 

 dium 20.9 per cent. With respect to grade the four bales of this cotton were 

 found to be proportionately less wasty than the two bales of Sea Island, and 

 these again were proportionately less wasty than the three bales of Sakellaridis. 



No relation was found to exist between the price of the different kinds of 

 cotton and the percentages of waste discarded in the manufacturing processes. 

 Arizona-Egyptian was estimated to be lower in commercial value than Sea 

 Island and Sea Island lower than Sakellaridis, when equivalent grades were 

 compared. No significant relationship was observed between the tensile strength 

 of the respective grades of Arizona-Egyptian cotton, and the difference in the 

 tensile strength of yarns made from the three kinds was practically negligible, 

 although the average results were somewhat in favor of the Sakellaridis Egyp- 

 tian cotton with the Sea Island standing second. The tensile strength for the 

 highest number of yarns was in favor of the Sea Island cotton. It is concluded 

 from the results that our domestic cottons are equal and in most respects supe- 

 rior to imported cottons. 



The results of a laboratory test indicated that after bleaching, dyeing, and 

 mercerizing, the Arizona-Egyptian and Sea Island cottons were practically equal 

 to each other and slightly superior to the Sakellaridis in their bleaching and 

 mercerizing properties. They were also found to be fully equal to each other 

 in dyeing properties, but in tensile strength the advantage was slightly in favor 

 of the Sea Island and Sakellaridis. The finished gray and mercerized yarns 

 were comparatively equal in luster, the yellow color being a little more evident 



