CONTENTS. Ill 



Pago. 



Nitrogen nutrition of Aspergillus niger, Brenner 26 



The role of nitrogen in plant metabolism, Petrie 26 



Can humus be directly assimilated by tlie higher plants? Molliard 26 



The influence of phytin on seedlings, Rose : 26 



The action of sulphur on plants, Boullanger 27 



The effect of ether and carbon bisulphid on plants, Koch 27 



Effect of guanidin on plants under different conditions, Schreiner and Skinner. 27 



The influence of chemicals on the germinating capacity of dodders, D'Jppolito. 28 



Sterilization of seed in relation to micro-organisms contained by them, Kossi. 28 



Influence of continued electric currents on the growth of plants, Kovessi 28 



The liberation of heat in respiration, Peirce 28 



Incipient drying in plants, Livingston 29 



The water balance of desert plants, MacDougal 29 



The relation of soil acidity to plant societies, Sampson 29 



The weeds of arable land in relation to the soils, II, Brenchlcy 29 



Toxic excreta of plants, Fletcher 30 



The injurious influence of tarred roads on neighboring vegetation, Mangin 30 



Lotus corniculatus, a cyanophoric plant, Armstrong and Horton 30 



Investigations on heredity, Johannsen 30 



On the cause of dimorphism in QiJnothera nanella, Zeijlstra 30 



Contribution to the study of buds, Perriraz 30 



Graft hybrids, Gregory 31 



International catalogue of scientific literature. M — Botany 31 



FIELD CROPS. 



Classification of field crop varieties, Merkel 31 



[Wisconsin farm crops experiments], Russell 31 



Results of cooperative experiments in agriculture, Zavitz and Squirrell 31 



[Fertilizer tests on swamp soils], Harcourt 32 



Adaptation experiments], Hampton 32 



Fertilizer and variety tests], Johnston 32 



Supplementary pasture crops, Fisher and King 32 



[Chemical and physical observations on Eritrea cereals], Manetti 32 



Trials with grains and legumes for feeding purposes, 1899-1908, Hansen 32 



Eighteen years' culture trials with root crops, Helweg 33 



The agave, Michotte 33 



Soils of the prairie regions of Alabama and Mississippi and use for alfalfa 33 



How to grow alfalfa, Wiancko and Fisher 33 



Genetic studies with the beet, Kajanus 33 



A new plant fiber, Zimmermann 33 



Local fertilizer experiments with cotton in South Alabama, 1911, Duggar et al. 33 



Local fertilizer experiments with cotton in North Alabama, 1911, Duggar et al. 34 



Cotton culture in North Carolina 34 



Heading off boll wee\al panic. Hinds 34 



British cotton growing. Reed 34 



Seed selection series. I, Broach cotton. Main 35 



Sakellaridis cotton 35 



[Cotton tests at the botanical garden of Palermo], Bozzi 35 



Fertilizing ingredients in Danish hay crops, Kristensen 35 



A note on onion couch. Underwood 35 



Potatoes at Wisley, 1911 35 



Six years' potato variety tests at Sindlingen, Adlung 35 



A new potato 35 



The thornless prickly pears, Griflfiths 35 



[Ad\dce on prickly pear destruction] 36 



San hemp (Crotolaria juncea), Pdtil 36 



Grain-sorgum production in San Antonio region of Texas, Ball and Hastings... 36 



Observations on the early flowering of the sugar beet, Munerati 36 



uweet clover, Westgate and Vinall 37 



The culture of cigar leaf tobacco in Texas, Olson 37 



Cultural tests of Herzegovina tobacco in Italy, Abbate 37 



Water content of soil, nitrogen fertilization, and development of wheat, Meyer. 38 



Report of the Danish seed control station, 1910-11, Dorph-Petersen 39 



[Tests of Bombay seeds], I, Mehta 39 



