1917] CONTENTS. ""***>.. ^ HI 



Page. 



Chalking: A useful improvement for clays overlying the chalk, Russell 519 



The relation of lime to magnesia in soils, Voelcker 619 



Influence of magnesia on wheat, Voelcker 519 



The influence of strontium salts on wheat, Voelcker 520 



Action of manganese, iron, and copper on the growth of plants, Vageler 520 



Concerning the use of commercial fertilizers in 1916 520 



Analyses of commercial fertilizers 520 



Official report on commercial fertilizers inspected dming 1914 521 



Commercial fertilizers, Cady 521 



Commercial fertilizers, Hills, Jones, and Anderson 521 



AGRICULTURAL BOTANY. 



Hereditary reaction system relations, Clausen and Goodspeed 521 



On the composition of factorial formula for zygotes, Fujii and Kuwada 521 



Observations on inheritance of sex ratios in Mercurialis annua, Yampolsky 522 



Inheritable variations in the yellow daisy (Rudbeckia hirta), Blakeslee. . .' 522 



A tetracotyledonous race of Phaseolus vulgaris, Harris 522 



Self, close, and cross fertilization of beets, Shaw 522 



Self-pollinations and cross-pollinations in Cichorium intybus, Stout 523 



Studies on the blooming of hemp, Havas 523 



The persistence of the style on fruits, Campbell 523 



Determinative action of enviionic factors upon Neobeckia aquatica, MacDougal . 523 



Plant ecology and the new soil fertility, Lipman 523 



Growing plants in large containers under control conditions, Wright 524 



An apparatus for aerating culture solutions, Weatherwax 524 



Preliminary report on synthetic media, Doryland 524 



The mechanism and conditions of growlh, MacDougal 524 



The nature of mechanical stimulation, Osterhout 525 



Energy transformations during the germination of wheat grains, Doyer 525 



Relation of soil moisture to transpiration and photosynthesis in com, Yuncker. 525 



On the relation between the rate of root growth and oxygen. Cannon 525 



The embryo sac and pollen grain as colloidal systems, Lloyd 526 



Content of amylase in ripening seeds of horse beans, Blagovieshchenskii 526 



Present status of problem of effect of radium rays on plant life, Gager 526 



The influence of ultraviolet rays on phosphorescent bacteria, Gerretsen 526 



Influence of inorganic salts on the development of Actinomycetes, III, Miinter. 526 



Note on the nitrogen nutrition of mold fungi, Brenner 527 



Variations in nodule formation, Leonard 527 



The physiological significance of the mycorrhizae of trees, Petri 527 



FIELD CROPS. 



The use of checks and repeated plantings in varietal tests, Pritchard 527 



The mode of pollination in some farm crops. Pope 527 



The identification of grasses by their vegetative characters, Carrier 527 



Dry farming in Utah, Harris and Ellison 528 



A twenty-year comparison of different rotations, Hartwell, Damon, et al 528 



[Field crops] 529 



Field experiments, 1915 529 



Catch crops 529 



Forage plants 529 



The history of Kentucky blue grass and white clover, Carrier and Bort 529 



Corn improvement in the Philippines, Jacobson 529 



Sea Island cotton, Orton 530 



West Indian Cotton Conference, 1916 530 



Flax seed for 1916 sowing 530 



Concerning the oat crop. Hills 530 



Observations on some degenerate strains of potatoes, Stewart 530 



Some disappointing seed potatoes. Hall 531 



Potatoes, Zavitz 531 



Correlative characters of the rice plant, Jacobson 531 



The weight of rice grains, Jacobson 531 



An early reference to Philippine rice varieties, Jacobson 531 



A Philippine wild rice, Jacobson 531 



The causes of low yields of rice in the Philippines, Jacobson 531 



Methods used to improve rice culture in the Philippine' sjacobson 531 



