XIX 



Proposed soil investigations by Oregon Station. (J. W. Shaw 412 



Soil moisture and temperature at Pennsylvania Station, W. Frear. 720 



Soil temjjeratures at Utah Station, J. H. Walker (52") 



On the tixation of nitrogen by the soil. A. (Jautier and R. Drouin .')52 



The formation and oxidation of nitrites during nitrilication, S. Wiuo- 



gradsky..- 550 



The formation of nitrates in the process of nitrification. S. Winogradsky r>'A 

 The comparative effect of sulphata of iron and sulphate of lime on the con- 

 servation of nitrogen in bare soils, and on nitritication, P. Pichard 917 



Effects of dilTerent pro|)ortions of clay and of organic nitrogen on the fixar 

 tion of atmospheric nitrogen, the conservation of nitrogen, and nitrifica- 

 tion. P. Pichai'd (!.■{() 



Absorption of atmospheric ammonia by arable soils. T. Schhising 110 



Composition of drainage watjrs from bare and cultivated soils, P. P. De- 



herain 492 



Lectures on the investigations at the Rothamsted Experimental Station, 



R. Warington 894 



Analyses of mesa .soil in Arizona, C. B. Colling wood 84(5 



Analyses of California soils _ 590 



Soil investigations by Louisiana Stations 861 



Analyses of soils by Nevada Station, ,T. W. Phillips ,30 



Analyses of soil at Utah Station. W. P. Cutter 624 



Geology of the Laramie Plains. J. D. Conley 52 



Soil of the farm of Wyoming Station. J. D. Conley 52 



Analyses of rock, clay, marl, peat, and gypsum at California Station 590 



Investigations of ''alkali" in soils, E. W. Hilgard and M. E. Jaffa .59i) 



The occurrence of common salt at different altitudes, A. Mimtz 197 



Recent observations on the amount of sulphur in arable soil and on the 



nature of the compounds which it forms, Berthelot and Andre 637 



Contributions to the knowledge of the nitrogenous compounds of ai-abk.' 



soil. Berthelot and Andre 117 



Decomposition of oi'ganic fertilizers in soil, A. Miintz li;^ 



The volatile nitrogenous compounds exhaled by arable soil, Berthelot_ . . 118 



Gain or loss of nitrogen by soils. A. Pagnoul 120 



The spontaneous oxidation of humic acid and humus, Berthelot and An- 

 dre 635 



Researches on humus substances, Berthelot and Andre 119 



Soil inoculation for yellow lupine, Salfeld 5.53 



New experiments in soil inoculation. Schmitter- 491 



Effect of sulphate of iron in the soil on the yield of different cereals, A. 



Mayer 919 



A new method for determining the fertilizer requirements of soils, A. 



Helmkampf 920 



METEOROLOGY— WATER. 



Relation of climatic conditions to the formation of nicotine in tobacco, A. 



M ay e r 65 



Relation of meteorological conditions to the development of corn, W. Frear 



and W. H. Caldwell 466 



Observations of rainfall and evaporation for 1889 at Nebraska Station, J. 



G. Smith 29 



Instructions for voluntary observers of the United States Weather Bureau. 



X. Russell... .,„ 817 



