II CONTENTS. [Vol 40 



Page. 



Studies on amylolytlc activity of human saliva, Myers and Dellenbaugh 609 



The preparation of sodium p-hydroxyphenylarsonate, Conant 609 



The classification of mimetic crystals. Wherry and Adams 609 



The permanent marking of glass vessels. Bock 609 



An all-glass nitrogen apparatus, Allen and Davisson 609 



Arsenious oxid as a standard substance in iodimetry, Chapin 609 



The iodotannic reagent, Tsakalotos and Dalmas 610 



Estimation of silica and sand, Lloyd 610 



Estimation of silica and sand, Dyer 610 



The gravimetric and volumetric determination of zinc, Jamieson 610 



The determination of nitrous acid and nitrites, Laird and Simpson 610 



On amino acids, Dakin 611 



The quantitative determination of hippurlc acid, Filippi 611 



Estimation of acidity in barley by titration in stages, Reichard 611 



Detection of milk in pastry, Grossfeld 612 



The estimation of cacao shell, Knapp and McLellan 612 



Detection of adulterations in maple products, .Jones 612 



Simplified preparation of alkaline copper solution, Justin-Mueller 613 



The determination of fructose in the presence of aldoses, Lenart 613 



The determination of lactose in milk, Porcher and Bonis 613 



Determination of saccharin in compressed tablets. Bonis 613 



Action of 10 per cent thymol-chloroform on urine, Halverson and Schulz 613 



Production of fats and oils in I'nited States, Bailey and Reuter 614 



The production of oil from fruit seeds, Schiitze 614 



Oxygen concentration and reduction of methylene blue by milk, Harvey 614 



The preservation of rice bran as press cake. Marcarelli 614 



Carbon dioxid formation in thickened fodder-beet juice, Claassen 615 



Utilization of breweries for dehydration, Grempe 615 



Fruit drying, Stalder 615 



Araucariti araucana (A. imbricata) and its resins, Angli 615 



METEOROLOGY. 



Subjects for research in meteorology 615 



Past and present climates of our leading crop plants, Cowles 616 



Some recent contributions to the physics of the air, Humphreys 616 



Seasonal precipitation 616 



The dustfall of March 9, 1918, Winched and Miller 616 



The dustfalls of March, 1918, Winched and Miler 616 



Monthly Weather Review 617 



Meteorological summary, 1917 617 



80IL8^FERTILIZEKS. 



Soil inoculation with Azotobacter, Emerson 617 



The partial sterilization of soils, Truffaut 619 



Absorbent power of dry and moist soils for chlorln, Berthelot and Trannoy_ 619 



The chlorln Index as a measure of richness in humus, Lapicque and Barbe. 619 



The composition of the soil air 619 



Layer formation In soil suspensions, Ehrenberg, Hahn, and Nolte t '. U « » 



The Nile silt ^ , 620 



A study of the Indigo soils of Bihar. Davis 620 



Nitrification and bacterial contents of 5 acid soils, Noyes and Conner 620 



Ma mire supplies under present conditions in Rhodesia, Flack 621 



The effect of unbalanced fertilizers, Schneidewind 621 



The use of ammonium nitrate as a fertilizer, Russell fvjJ 



Conversion of quicklime in soil, Hager 622 



Inspection of commercial fertilizers, 1918, Halgh 6-!2 



FIELD CBOPS. 



Field crops, Wilson and Warhurton 622 



Practical guide to tropical agriculture. — I. General principles, Fauchdre _ 622 



Determining yields of plats of grain by rod-row method. Amy and Garber. 623 



The practical value of line selection with field crops Koch 623 



