CONTENTS. Ill 



Page. 



The action of ammonium sulphate and sodium nitrate, Liudenberg 321 



The solubility of organic forms of nitrogen in fertilizers, Street 322 



Nitric acid from air nitrogen 323 



Calcium cyanamid: Its analysis and the changes it undergoes, Brioux 323 



The decomposition of cyanamid by mineral constituents of the soil, Kappen. . 323 



Experiments with potash fertilizers, Schneidewind, Meyer, and Miinter 323 



Increase in the world's consumption of potash for agriculture, Maizieres 324 



[Meeting of scientists interested in the potash industry] 324 



The geological investigation of phosphorite deposits, Arkhangelskii et al 324 



The method of formation of tricalcic phosphate in Algeria and Tunis, Roussel. . 324 



An important new source of phosphate, Maizieres 324 



The availability of the phosphoric acid of different phosphates, Gedroits 324 



Agricultural value of calcined and ground phosphates, De Molinari and Ligot. . 325 



Gypsum deposits of New York, Newland and Leigh ton 325 



Can the lime of calcium silicate serve as plant food? Mieth 325 



The use of gas liquor for fertilizing purposes, Rygard 325 



Report on commercial fertilizers, 1910, Jenkins and Street 325 



Report of analyses of commercial fertilizers and Paris green, Halligan 326 



Commercial fertilizers in 1909-10, Fraps 326 



AGRICULTURAL BOTANY. 



Soil bacteriological investigations, Heinze 326 



Bacteriological relations under greenhouse conditions, Lipman and Owen 327 



Measuring the activity of aerobic bacteria in the soil, Hesselink van Suchtelen . . 327 



Assimilation of nitrogen by micro-organisms, Bierema 327 



Wliite mustard in its relation to nitrogen assimilation, Lemmermann et al 327 



The influence of fertilizers on straw 328 



Effect of salts on respiration of plants and enzyms, Zaleski and Reinhard 328 



The action of ultraviolet rays on plants containing coumarin, Pougnet 328 



Exchange of gases during formation and destruction of anthocyanin, Combes. . 328 



The role of catalase in plants, Rosenberg " 329 



The chemistry of chlorophyll, Willstatter 329 



Perception of light in plants. Wager 329 



Effect of longitudinal compression on mechanical tissue in stems, Pennington. . 329 



The delayed germination of seeds, Pammel 330 



Relation of soil moisture to desert vegetation, Livingston 330 



The fundamental causes of succession among plant associations, Cowles 330 



Mineral content of the leaves of fruit trees, Richter 331 



Amount of copper in tea sprayed with Bordeaux mixture, Annett and Kar 331 



FIELD CROPS. 



The electrification of crops, Robertson 331 



Report of cooperative forage crop work at Chillicothe, Tex., 1909, Connor 332 



[Variety tests of grains and alfalfa], Willis 334 



Agronomy and seed division, Macmillan 334 



Variety tests of cotton and corn, 1910 335 



Barley culture in the Southern States, Derr 335 



A new awnless barley, Derr 335 



Clover in the Palouse country. Severance 336 



[Work with cotton on the Iredell Test Farm in 1903-1909], Kilgore et al 336 



Cultivation of guinea grass, Narayan Rao 336 



A new fodder plant, Kenny 337 



Cloth made from seaweed, Baker 337 



Experimental work, 1909, Charlan 337 



Report of the tobacco expert, Stella 337 



The management of tobacco seed beds, Hinson and Jenkins 338 



The burning quality of tobacco, with suggestions for improvement, Mathewson. 338 



Distribution of seeds and plants, Wickson and Mansell 338" 



Agricultural seeds and their weed impurities, Johnson and Hensman 338 



Report of the seed tester, Treleaven 338 



Cuscuta obtusiflora hreviflora, Mal'tsev 338 



The error of experiment in agricultural field trials, Hall and Russell 339 



Plant breeding, Cockayne 339 



