CONTENTS. Ill 



Page. 



The acid content of moor water, Endell 216 



Tho improvement of marsh soils, Luodocke 216 



How can the farmer maintain the fertility of the soil? Hopkins 216 



The value of different crops as green manm-es, Hall 216 



The fisheries and the guano industry of Peru, Coker 216 



Bat and bird guanos in India, Burkill 216 



Report of experiments with nitrogenous maniu-es, Milbum and Gaut 216 



The utilization of the nitrogen of the air, Frenzel 217 



Preparation of nitric acid from the air by the Pauling process, Vanderpol 217 



Use of cyanamid in France, Mason 217 



Results of fertilizer experiments with potassium silicate during 1910, Wein 217 



Investigations on the action of ground phonolite, Kriiger et al 217 



Fifty years of the German potash industry, Krische 217 



The fertilizing value of certain phosphatic materials, Gregoire and Hendrick. . 217 



The production of phosphate rock in 1909, Van Horn 217 



The gypsum industry in 1909, Burchard _ 218 



Rocks and waters of Roman Campagna as to lime, De Angelis d'Ossat 218 



Molasses as a fertilizer, Martin 218 



On the composition and fertilizing value of peat ash, von Feilitzen 218 



[ Fertilizing materials], Darbishire and Goodwin 218 



Analyses of fertilizers sold in Maryland, ^IcDonnell et al 218 



Inspection of commercial fertilizers, Trowbridge et al 218 



Analyses of fertilizers, Kilgore et al 218 



Commercial fertilizers, Fulmer 219 



AGRICULTURAL BOTANY. 



The water balance of succulent plants, MacDougal and Spalding 219 



Estimating gaseous exchanges of submerged plants, Blackman and Smith 220 



On assimilation in submerged water plants, Blackman and Smith 220 



Relation of living cells to transpiration and sap flow in Cyperus, II, Overton 220 



Temperature coefficient of the duration of life of barley grains, Goodspeed 221 



Chlorophyll and light in transformation of CO., and aqueous vapor, Dubosc. . . 221 



Respiratory energy of plants cultivated in different degrees of light. Rose 221 



The portion of the spectrum influencing photosynthesis, Dangeard 221 



Leaf decay and autumn tints, Keegan 221 



The influence of acidity on germination, Promsy 222 



Use of solutions of potash to determine germinative faculty of seeds, Lesage. . 222 



Effect of activation of atmosphere by radium on germination and growth, Fabre. 222 



Nitrogen and chlorophyll in galls and etiolated leaves, MoUiard 222 



The utilization of ammonium salts by green plants, Pantanelli and Severini. . . 223 



Investigations on nitrogen assimilation in green leaves, Otto and Kooper 223 



Absorption of barium, strontium, and calcium, Colin and De Rufz de Lavison. 224 



Excretion of mineral and organic substances by roots and water pores, Maze. . 224 



Reduction by roots, Schreiner and Sullivan 224 



Some investigations on the action of wind on plant growth, Cavara 224 



Plants and tobacco smoke, Molisch 225 



The comparative toxicity of vegetable volatile oils on plants, Coupin 225 



The use of saponin in the preparation of insecticides and fungicides, Gastine . 225 



Agricultural bacteriolog}', Percival 225 



A bacteriological museum at the American Museum of Natural Historj-, Winslow. 225 



The proposed microbiological central station in Berlin, Rahn 225 



Contributions to the cytology of the bacteria, Dobell 226 



Nuclei equivalents and nuclei of Azotohacter chroococcum, Mend 226 



On the mineral needs of Azotobacter, Kaserer 226 



Viability of Pseudomonas rarlicicola on ash-maltose-agar, Edwards 226 



The influence of quartz sand upon microbial cultures, Rahn 226 



Biochemical factors in the soil, Sullivan 226 



Bacteria of frozen soil. Conn 227 



On methods of measuring the bacterial activity of cultivated soils, Perotti 237 



Ammonification in soils and in solutions, Stevens, Withers, et al 227 



Determining nitrifying and ammonifying powers of soils, Stevens and Withers. . 227 



Bacteriological studies of soils of Truckee-Carson project, Kellerman and Allen. 227 



Upon assimilation of atmospheric nitrogen by fungi, Pennington 228 



Experiments with cyanamid-decomposing bacteria, Kappen 228 



The clogging of drain tile by roots, Stone , , 228 



