n CONTENTS. [Vol. 36 



SOILS — PERTILIZEK3. 



PaRC. 



Soil Burvey of Polk County, Georgia, Long and Baldwin 508 



Soil survey of Jessamine County, Kentucky, Allen 508 



Soil survey of Gage County, Nebraska, Meyer, Bum, and Bengtson 509 



The soils and agricultural development of northern New York, Fippin 509 



Soil survey of Wake County, North Carolina, Brinkley et al 509 



Soil survey of Geauga County, Ohio, Mooney et al 509 



Some alkali soils in Ohio, Ames 510 



Soil survey of Frederick County, Virginia, Dickey and Cobb 510 



Loess soils of Nebraska portion of transition region, I, II, Alway et al 510 



[Composition of caliche], Vinson and Catlin 511 



Soil colloids, McGeorge 512 



Absorption and solution of ammonium and phosphate salts, Stratmann 512 



Influence of trees on dissolved salts in upland moor soil, Raniann and Niklas. . 512 



The present status of the humus nitrogen problem in arid soils, Lipman 513 



The factors concerned in soil productivity, Hoffmann 513 



Incubation studies with soil fungi, Waksman and Cook 513 



Some effects of leaching on the soil flora, Lipman and Fowler 514 



Nitrification in relation to the reaction of the soil. White 514 



Effect of 1.14 in. of rainfall on nitric nitrogen and acid content, White 514 



Stimulating influence of arsenic upon the nitrogen-fixing organisms, Greaves. . 515 



Can soil be sterilized without radical alteration? Coleman et al 515 



The effect of partial sterilization on plant growth, McGeorge 515 



Variation in the growth of clover on Mitchell field (A), White 516 



Soil-management problems - 516 



[Keclamation of alkali soils], Barnes 516 



[Soils and fertilizers]. Miller 516 



Effect of fertilizers on soil structure as indicated by draft of a plow, Noll 516 



Meadow fertilization experiments, Stein 516 



FertiHzer ratio experiments with grass on Hagerstown loam, Noll et al 517 



Legumes as green manure, McGeorge 517 



Legume inoculation and nitrogen fertilization on upland moor, Tacke .... 517 



Infiuence of the distribution of nitrogenous fertilizers and straw, Niklewski. . . 518 



Pot fertilizer experiments with new nitrogenous fertilizers, Popp 418 



Nitrogen fertilization experiments, in 1914-15, Eitter and Klebergel 519 



Experiments with nitrogenous fertilizers, 1911 to 1913, Rindell 519 



The action of gaseous ammonia on superphosphate, Gerlach. 519 



Availability of mineral phosphates for plant nutrition, Burlison 520 



Raw rock phosphate v. acid phosphate, Thome 520 



Interrelationships between the constitutents of basic slag, Collins and Hall 520 



Solub ility of the phosphoric acid in Thomas meal in carbon dioxid, Maschhaupt . 521 



Geological investigation of phosphorite beds in Russia, 1913, Samo'ilov 521 



Phosphates and dolomites of Johnson County, Tennessee, Jenkins 522 



Experiments with lime and waste carbonate, 1913 and 1914, Lauder et al 522 



Effect of quicklime on organic matter in soils, Bear 522 



Experiments with catalytic manures, Giannosi 523 



Composition of some oil cakes used as fertilizer in Tonkin [Indo China], Bloch. 523 



AGRICULTURAL BOTANY. 



Starch congestion accompanying certain factors which retard growth, Hartwell . 523 



Potato tuber production above ground, Vilikovsky 523 



The origin of anthocyanin pigments, Guilliermond - 523 



Recent observations on pollen formation in certain monocotyledons, Guignard. 523 



The ripening of seeds in legumes, Schneider 524 



Parallel tests of seeds by germination and by electrical response, Fraser 524 



Relations between light and germination, Ga?sner 524 



Studies in electroculture, Trnka, Mysik, and Sajfert 524 



The influence of radio-activity on dissimilation processes, Zdobnickj 524 



Are spore-forming bacteria of significance in soil? Conn 524 



A possible function of Actinomycetes in soil, Conn 525 



Number of colonies allowable on satisfactory agar plates. Breed and Dotterrer. 525 



Agar and gelatin as media for the plate method, Conn and Dotterrer 525 



FIELD CROPS. 



[Experiments with field crops], McOmie 526 



[Breeding work with field crops], Freeman and Uphof 527 



Report of the agronomy department, Sahr '. 527 



