II CONTEXTS. [Vol.40 



Page. . 



Synthesis of photosensitizing dyes, pinaverdol and pinacyanol, Wise et al 711 



Determination of total nitrogen including nitric, Davisson and Parsons 711 



A method for the rapid reduction of potassium platinic chlorid, Horsch 711 



The gravimetric and volumetric determination of mercury. Jamieson 712 



Colorimetric determination of organic substances, Heidenhain 712 



The determination of zinc and copper in gelatin, Jamieson 712 



The chemical investigation of spoiled meat. Falk, Baumann, and McGuire 712 



Ammonia test for meat spoilage, Falk and Mc< mire 713 



Determination of blood sugar'by modified picric acid method, Benedict 713 



Simplification of method for plasma chlorids. Van Slyke and Donleavy 714 



Laboratory manual of Pfister and Vogel Leather Company, compiled by Levi . . 714 



The American Leather Chemists' Association, 1918 714 



Means to prevent rancidity of vegetable margarin, Jacobsen 714 



Grain as a source of fat, Lindner 714 



Dry sugar-beet powder and its utilization to partly replace refined sugar 715 



Orange vinegar instead of apple product in citrus regions 715 



METEOROLOGY. 



Influence of velocity of wind on lower layers of atmosphere, Brazier 715 



Nocturnal cooling of air and soil in relation to humidity, Defanl 715 



[Observations on aerology] . 715 



A simple nonabsorbing atmometer mounting, Johnston 715 



The measurement of rainfall and snow, Horton 715 



Some practical uses of rainfall records, Hastings 715 



Climatological data for the United Slates l>y stations 716 



Meteorological observations at Berkeley from 1SS7 to 191 ~, Varney 7 1 (1 



The weather of the year 1917, Connor 716 



On warm and cold summers, Ilellmann 716 



Phonological observations during 1917 and 191S, Bos 716 



The influence of the weather on the yield of wheat. Boward 716 



The Australian environment (especially as controlled by rainfall . Taylor 716 



The progressive desiccation of Africa: The cause and remedy, Schwarz 717 



SOILS — FERTILIZERS. 



Soil erosion in Iowa, Eastman and < rlass 717 



Recent investigations on soil aeration, Howard ami Bole 718 



Vegetation on swamps as an indicator of quality of peat soil, Dunnewald 718 



A study of soil solutions by means of a semipermeable membrane, Schuster. . . 718 



[Report on soil work in Washington] 719 



The "alkali" content of soils as relate, 1 to crop growth, Shutt and Smith 719 



The translocation of calcium in a soil, Wilson 719 



An electrical method of determining the lime requirement of soils, Lynde 720 



The effect of heat on the lime requirements of soils. Noyes 720 



Studies on proteolytic activities of soil microorganisms, Waksman 721 



Effect of prolonged growing of alfalfa on nitrogen of soil, SwansoD 7_'L' 



Influence of salts on nitric-nitrogen in soil, Greaves e1 al Te- 

 stable manure and nitrification in the soil, Berthel and IVnurtsson 723 



Decomposition and preservation of liquid manure, Blanck 723 



Fertilizer experiments on DeKalb soil. White 723 



[Work with fertilizers on the Canada Experimental Farms, 191ti] 724 



Can Ohio farmers afford to buy complete fertilizers? Thome. 7L'4 



Decomposition of cyanamid and dicyanodiamid in the Boil, Cowie 7'J 1 



A geologic reconnaissance for phosphate and coal, Schultz 725 



Rational preparation of superphosphates, Aita 725 



Conversion of insoluble phosphates, Johnston 725 



Potash in 1917, Gale and Hicks 725 



Potash, Bradley 725 



Chemical analyses of marine algae, Sauvageau 725 



Sulphates of potash and of potash and magnesia, Schneidewind 725 



Waste lime from acetylene manufacture 725 



Magnesium and sulphur nutrition of plants . 726 



Contribution to the agricultural study of iron, Monnier and Kmv.ynski 726 



Report on commercial fertilizers. 1918, Jenkins and Bailey 



Commercial tertilizers in 1917-18, Fraps 726 





