II CONTENTS. CVol. 38 



Page. 



Preservation of Virginia fruits and vegetables, Roberts 616 



Preservation of unfermented grape juice, Anderson. 617 



Improvements in methods of pickling olives, Bioletti and Cruess 617 



METEOROLOGY. 



The meteorological resources of the Empire, Lyons 617 



Report of the chief of the Weather Bureau, 1917 617 



Climatological data for the United States by sections 618 



Meteorological summaries 618 



Meteorological observations at Massachusetts Station, Ostrander et al 618 



The climate of Tennessee, Nunn 618 



Climate and meteorology _. 618 



Meteorological records at Ottawa, Ellis 619 



The fertilizing value of rain and snow, Shutt 619 



SOILS — FERTILIZERS. 



Soils 619 



Studies in soil reaction as indicated by the hydrogen electrode, Plummer 620 



Hydrogen-ion concentration measurements of soils, Gillespie and Hurst 620 



Soil survey of the San Fernando Valley area, Cal. , Holmes et al 621 



Soil survey of Howard Coimty, Md., Carter, jr., and Hull 621 



Soil survey of Bottineau County, Doneghue 621 



Soil survey of Kay County, Okla. , Kirk and Jurney 621 



Further studies of the nature of ammo nifi cation, Miyake _ 621 



Nitrogen and carbon in cultivated land and land abandoned, Blair and McLean 622 



Loss of organic matter in clover returned to soil, Boltz and Schollenberger 622 



Decomposition of green and stable manures in soil, Potter and Snyder 623 



Ten wheat fields in ' ' Egypt." — A story in figures, Hopkins et al 624 



Fertilizer experiments, Shutt _. 624 



The proper season for application of fertilizers to sugi, Moriya 624 



The cause of the injurious effect of sulphate of ammonia, Ruprecht and Morse. - 624 



Electrochemical atmospheric nitrogen fixation industry, Scarpa 625 



Method of sale of hitrate of soda to farmers by the United States 625 



Nitrogen from sewage, Rideal 625 



Acid jjhosphate v. raw rock phosphate, Thome 625 



Domestic supplies of potash, Jenkins 625 



The fertilizing value of some household wastes. Browning 626 



Inspection of commercial fertilizers, Haskins et al 626 



Fertilizing materials, Shutt 626 



AGRICULTURAL BOTANY. 



Leaf product as an index of growth in soy bean, Hildebrandt 627 



Seasonal variations in growth of buckwheat in greenhouse, Johnston 627 



The effect of aeration on the growth of buckwheat in water cultures. Free 627 



Effect of deficient soil oxygen on roots, Livingston and Free 628 



Effects of certain mineral poisons on young wheat plants, Free and Trelease. . . 628 



Symptoms of poisoning in Pelargonium and other plants. Free 628 



Sterilization of popcorn, Brigham 629 



The presence of ammonia and of ammonium salts in plants, Weevers 629 



A method for approximating sunshine intensity, Hildebrandt 629 



Inventory of seeds and plants imported from October 1 to December 31, 1914.. 629 



FIELD CROPS. 



[Report of field crops work in Kansas, 1915-16] 630 



[Report of field crops work at Missouri Station, 1916-17], Helm et al 632 



[Report of field crops work in New Mexico, 1916-17] 633 



[Field crops work at the Canada stations and farms in 1915], Grisdale et al. . . . 634 



Report of Mandalay Agricultural Station for 1915-16, Thompstone and Sawyer. 635 



Report of the Padu Agricultural Station for the year 1915-16, Thompstone 635 



Driage. — The loss in weight of crops after harvesting, Evans 635 



Grass land and plowed land, Stapledon 635 



Grain production in Nevada, Knight 636 



[Hybridization studies with spelt and wheat], Gmelin 636 



