II CONTENTS. , [Vol.40 



Page. 



Notes on the reactions of bacteriologic media, Norton 805 



A mechanical pipette for easy measurement of small volumes, Bazett 806 



Protection against drip water in an extraction apparatus, Liebert 806 



Picramic acid as a standard in Nessler's method, Egerer and Ford 806 



A scrubber for ammonia distillations, Davisson 806 



Recovery of platinum and alcohol from the potash determination, SmolL 806 



A sensitive copper reaction, Maquenne and Demoussy 807 



Estimation of the water content of meat products and sausages, Seel 807 



Judging buttermilk porridge, Filippo 807 



The determination of the content in oil of oleaginous seeds, Biazzo 808 



A method for the purification of certain azo dyes, Lubs 808 



Practical industry of preserving food, Olivan 808 



Muscadine grape paste, Dearing 808 



Cholam as a substitute for barley in malting, Viswanath et al 808 



How to make cider and vinegar, Lewis 808 



METKOBOLOGY. 



Rainy days and rain probability in the United States, Ward 808 



Ammonia and nitrous nitrogen in rain water of Alaska, Shipley 809 



The nitrogen compounds in rain and snow, Shutt and Dorrance 800 



Precipitation, run-off, evaporation, and drainage in Europe, Fisher 810 



Normal mean value of rainfall in Italy, Eredia 810 



The influence of rainfall on the fruit crop in Norway. Skard 810 



Report on meteorological observations at Wisley, 1017, Curtis 810 



Phonological observations on cereals in Bavaria in 1917, Hiltner 811 



Annual rainfall and mean temperature [of Ceylon], Drieberg _ 811 



The ice-age question solved, Marriott 811 



SOILS KKRTIUZKRS. 



Influence of organic matter on water-holding capacity, Alway and Nelter. 811 



Nitrate and nitrite formation in moor soils, Arnd 811 



Reactions of soils supporting growth of certain native orchids, Wherry. _ 812 



Solubility of lime, magnesia, and potash, Gardiner 812 



Nitrogen content of vulcanic ash in Katmai eruption of 1912, Shipley 812 



Salt content, ferrous iron, and acidity of Katmai ash, Shipley 812 



Soils, agriculture, and other resources of Kenai Peninsula, Bennett 813 



Soil survey of Covington County, Miss., Jones ami Sweet 813 



Soil survey of Phelps County, Nebr., Tillman ami Hensel 818 



Soil survey of Wayne County, Nebr., Tillman and Hensel 814 



Soil survey of Clearfield County, Pa., Winston et al 814 



Soil survey of Shelby County, Tenn., Bennett et al 814 



Soil survey of Windsor County, Yt., Kerr and Jones 814 



The oxidation of ammonia, Partington 815 



Fertilizer experiments with spoiled calcium cyanamid, I'opp 815 



Determination of the value of agricultural lime, Conner 815 



Cost of burning lime in the stack or heap, Froar and Goodling 816 



Report on limestone resources of Pennsylvania, Frear and Kern 816 



Calcareous marl finds increasing use in agriculture 816 



Sulphuric acid and fertilizer trades 816 



ACKKTI.TrKAT. HOTANY. 



The unification of American botany, Lyman 817 



Note on technique of solution culture experiments with plants, Hoagland 817 



The dendrograph for recording growth in trees, MacDougal S17 



Plant genetics, J. M. and M. C. Coulter SI 7 



The chromosomes, their numbers and general Importance, Winge 817 



The mitochondrial origin of plastids, Guilliermond 818 



A colloidal hypothesis of protoplasmic permeability, Free 818 



The effect of potassium and sodium on hydration and growth, Lloyd S1*> 



Colloidal properties of plant mucilages as affected by stains, Lloyd 818 



The mucilage of Opuntia, Abutilon, and Oenothera, Lloyd 810 



Pine needles, their significance and history, Pufrenoy 810 



The present state of the study of anthocyanln, Beauverle 819 



