n CONTENTS. 



SOILS — FERTILIZERS. 



Page. 



Field operations of the Bureau of Soils, 1910, Whitney et al 16 



[Porto Rico soils], Zerban 17 



The nature of the dry farm soils of Utah, Widtsoe and Stewart lii 



The soil of the Southern Utah Experiment Station, Widtsoe and Stewart 18 



Two volcanic loams of Japan, Seki 18 



The mineralogical analysis of soils. Fry 19 



Soil and crop and their relation to state building, Hume 19 



The action of the soil on substances in suspension and in solution, Petit 19 



Effect of mixing with a lighter soil moor soil, marl, clay, and straw, Gerlach... 19 



Improvement of an agricultural soil near Rome, De AngeUs d'Ossat 19 



Action of soils containing graphite on germinating and growing plants, Kryz... 19 



Soil temperature in its relation to plant growth, Naegler 19 



Bacterial activity as a function of grain size and moisture content, Rahn 20 



Bacterial activity and size of soil particles and water content, Rahn 20 



Nitrifying and ammonifying powers of North Carolina soils, Stevens et al 21 



Miscellaneous nitrification experiments, Stevens, Withers, et al 21 



The intensity of nitrification in arid soils, Stewart 21 



Water-soluble matter in soils sterihzed and reinoculated, Lyon and Bizzell. . . 22 



Studies in plant nutrition, II, Jordan 22 



Action of fermenting manure on phosphates, Tottingham and Hofiman 23 



Nitrogenous fertiUzers for field crops, Malpeaux 23 



Relation of the production of alumina to fixation of nitrogen. Tucker 24 



Ammonium sulphate from ammonia and sulphur dioxid, Feld 24 



The electro technical production of ammonia 24 



Manufacture and uses of cyanamid, Pranke 24 



On calcium cyanamid as a fertilizer, Sebelien 24 



Is it wise to mix cyanamid with superphosphate? Christensen 24 



Production of phosphate rock in Florida during 1912, Sellards 25 



Utilization of acid and basic slags in manufacture of fertilizers, Waggaman 25 



Alunite and kelp as potash fertilizers. Skinner and Jackson 25 



Limino; for Tennessee soils, Mooers 25 



Investigations on the fertilizing action of sulphur, Demolon 25 



The fertilizing action of sulphur, Demolon 26 



AGRICULTURAL BOTANY. 



The cause of ^wth in plants, I, Borowikow 26 



The role of acids in germination, Promsy 26 



Sunlight and plant assimilation, Miintz 26 



The effect of supramaximal temperatures on plants, Lepeschkin 27 



Is the form of trees determined by wind? Jaccard 27 



Sex anomalies in hops and hemp by diminished transpiration, Toumoia 27 



Estimating the respiratory (quotient of green plants, Maquenne and Demoussy . . 27 



Apparent fallacies of electrical response in cotton plants. Balls 27 



Recent studies on carbon assimilation, Pollacci 28 



Variations in the sodium-chlorid content of nonhalophytes, Blackledge 28 



The occurrence of manganese in plants, Jadin and Astruc 28 



Substitution of glucinium in cultures of Sterigmatoq/stis nigra, JavUlier 28 



Replacement of zinc by glucinium in cultures of Aspergillus niger, Lepierre. . . 28 



Decomposition of urea, uric acid, hippuric acid, and glycocoll, Kossowicz 28 



Assimilation of nitrites by mold fungi, I, Kossowicz 29 



The relation of some mold funo;i to calcium nitrate, I, II, Kossowicz 29 



The assimilation of guanin and guanidin by mold fungi, I, Kossowicz 29 



Sulphocyanic compounds for mold fungi, I, Kossowicz and von Groller 29 



Relations of yeast and mold fungi to sodium thiosulphate, Kossowicz and Loew. . 29 



Relations of yeast and mold fungi to sodium thiosulphate, Kossowicz and Loew. . 30 



Spore formation in Aspergillus fumigatus, Sauton 30 



Bacterial tubercles in leaves, Miehe 30 



Testing cultures of nodule-forming bacteria, Kellerman 30 



Smoke injury to plants, Bokomy 30 



The weeds of arable land, III, Brenchley 30 



Constitution of latex of Euphorbia and systematic position, von Wiesner 30 



Heterozygosis in evolution and in plant breeding. East and Hayes 31 



The improvement of medicinal plants, Miller 31 



