1917] CONTENTS. HI 



Page. 



Effect of sodium salts in water cultures on absorption of plant food, Breazeale. . . 431 



Assimilation of iron by rice from certain nutrient solutions, Gile and Carrero. . . 431 



The influence of manganese on plants, Masoni 432 



The nutrition of green plants by means of organic substances, Ravenna 432 



Disappearance of cumarin, vanillin, pjTidin, and quinolin in soil. Robbing. . . 432 



Studies in permeability. — III, Absorption of acids by plant tissue. Hind 433 



Production of root hairs in water, Bardell 433 



A method for maintaining a constant volume of nutrient solutions, Clark 433 



Proposed classification of the genus Rollinia, with new species, Safford 433 



Desmopsis, a new genus of Annonaceae, Safford 433 



Pleiospermium, a new genus related to Citrus, Swingle 433 



Origin of new varieties of Nephrolepis by orthogenetic saltation, I, Benedict. . 434 



The mutual influence of genotypical factors, Tammes 434 



Dry grassland of a high mountain park in northern Colorado, Ramaley 434 



Fungus flora of Texas soils, Werkenthin 434 



Relative importance of fungi and bacteria in soil. Conn 434 



FIELD CROPS. 



Report of [field crops] work at Fairbanks Station, Neal 435 



Report of [field crops] work at Kodiak Station, Snodgrass 435 



Report of [field crops] work at Rampart Station, Gasser 436 



[Field crop] notes at Sitka Station, Anderson '. 437 



Results of experiments, 1915, Richardson 437 



Pasture crops in the prairie provinces, Harrison and Bracken 437 



Germination experiments with grasses and legumes, Burgerstein 437 



Crucifera and grasses with reference to soil nitrogen, Pfeiffer et al 438 



Grasses with creeping roots. — Advantages and disadvantages, Breakwell 438 



[The production of young grasa with sulphate of ammonia], Neubauer et al 438 



[Chlorin requirement of the buckwheat plant], Pfeiffer and Simmermacher. . . 439 



Corn growing under droughty conditions, Hartley and Zook 439 



Some factors influencing yield in maize, Wenholz 439 



Hulled oats, Overgaard 439 



Potato experimental fields, 1915-16, Ramsay 440 



Sweet potato ciuing in Texas, Cole 440 



Relationship between the average wheat yield and winter rainfall, Richardson . 440 



Experiments with the manui'in^ of wheat, Coleman 440 



Researches on wheat selection, 1, Richardson and Green 440 



The cross- fertilization of wheats, Spafford 441 



Wheat breeding in New South Wales, Pridham 441 



Notes on some recently imported wheats, Guthrie and Norris 441 



Seed wheat. — Varieties for distribution among farmers, Richardson 441 



Cost of production of field crops, Wilson and Whelan 441 



Improved apparatus for determining the test weight of grain, Boerner 441 



Rules and regulations imder the United States Grain Standards Act, Houston. 442 



Clover and grass seed inspected in 1914, Smith 442 



Determination of the seeds of Cuscuta trifolii and C suaveolens, Bernatsky 442 



A new weed, Quinn and Andrew 442 



Some points in fan weedcontrol 442 



HORTICULTURE. 



[Horticultural investigations in Alaska], Georgeson, Anderson, et al 442 



Some garden plants in the Portici Royal Agricultural High School, de Rosa. . . 443 



Two winter salads, endive and Witloof, Bussard 443 



Modern fruit marketing. Brown 443 



The Christ -Junge taxation method ; general rules for horticultm-al plants 443 



Cost of producing apples in Wenatchee Valley, Wash. , Miller and Thomson 443 



The general cost of establishing a meadow orchard of cider apples, Truelle 444 



Methods and problems in pear and apple breeding, Ballard 444 



Pear breeding, Ballard 444 



Growing cherries east of the Rocky Mountains, Gould 444 



Self-eterility in dewberries and blackberries, Detjen 444 



The sycamore fig in Egypt, Brown and V\'alsingham 445 



The best jjiapaws 445 



Cocos nucifera, Hunger 445 



The cultivation of limes, Harrison et al 445 



