1917] CONTENTS. HI 



The solubility of slowly soluble phosphates in citric acid, Aita 727 



Valuation of water-soluble v. citrate-soluble phosphoric acid, Pranke 727 



The Garrison and Philipsburg phosphate fields, Montana, Pardee 728 



[Biotite, phonolite, and similar substances as sources of potash], Chirikov 728 



Blast-furnace slag as a source of bases for acid soils, Ames 728 



The fertilizer value of city waste. — I, Garbage, O'Brien and Lindemuth 728 



Commercial fertilizers, 1916, Woods et al 728 



Analysis of fertilizers for 1916, Curry and Smith 729 



AGRICULTURAL BOTANY. 



Experimental studies in the physiology of heredity, Blackman et al 729 



The calculation of linkage intensities, Emerson 729 



Morphology and evolution of leaves. Cook. . y. 729 



The natvire and distribution of the statolith apparatus in plants, Prankerd 729 



The influence of gaseous pressure on growth, McLennan 730 



Transformation of pigments of plastids in living tissues of plants, Lfubimenko. . 730 



The mechanism of photosynthesis, Rikhter (Richter) and Kollegorskafa 730 



The distribution of reducing sugar in beets, Pellet 731 



Studies upon the maturity of grains. — I. Blagovleshchenskii (Blagovescenskij) . 731 



[Report of the research assistant in plant physiology], Hibbard 731 



On the interpretation of the results of water-culture experiments. Stiles 731 



The effect of vanillin and salicylic aldehyde in culture solution. Skinner 731 



Antagonism of manganese and iron in growth of wheat, Tottingham and Beck. 731 



Electromotive phenomena in plants, Waller et al 732 



The effect of electrical stimulus on the permeability of plant cells, Koketsu. . . 732 



The influence of defoliation on the development of sugar beet, Pellet 732 



The effect of insecticides on flowering plants, Shreiber (Schreiber) 733 



Snow cracks on trees as an indication of the amount of bending, Maekawa 733 



The ecological significance of soil aeration. Cannon and Free 733 



Distribution of cacti with reference to soil temperature and moisture. Cannon. . 733 



Osmotic pressiu-e in roots and leaves of plants, Il'in (Iljin) et al 733 



Transpiration and assimilation in steppe plants, Il'in (Iljin) 734 



Teratological notes. — I, Abnormal seedlings. Hardy 734 



Identity of cohoba, the narcotic snuff of ancient Haiti, Safford 734 



A fungus producing hydrocyanic acid and benzoic aldehyde, Guyot 734 



FIELD CROPS. 



Report of division of farm crops, Shoesmith and Spragg 734 



[Field crop experiments], Watts 735 



Report on field experiments, 1914, Wilson and Smith 735 



Fall-sown grains in Maryland and Virginia, Stanton 735 



Seed-flax production, Clark 736 



Change of sex in hemp, Pritchard 736 



Rice variety studies, van Drent 737 



[Sugar cane] 737 



Breeding sugar cane 737 



Studies m Indian sugar canes. — II, Sugar-cane seedlings. Barber 737 



Production of sugar in the United States and foreign countries, Elliott 737 



Maniu-ing of swedes with different phosphatic manures; purchase of basic slag. . 738 



Manuring of swedes with different phosphatic manures 738 



The suppression of characters on crossing. Biff en 738 



Work in connection with Egyptian wheat. Dudgeon and Bolland 739 



Carman's wheat-rye hybrids, Leighty 739 



Seed reports, 1914, 1915, Kellogg and Gensler 739 



Results of seed tests for 1916, Taylor and Prince 739 



Michigan weeds, Beal 739 



Kill garlic and wild onion by oil spraying, Selby and Van Atta 740 



Eradication of bracken 740 



Improvement of hill and peaty pastures; eradication of bracken 740 



HORTICULTURE . 



On the problem of extra root nutrition and treatment of trees, Lmbimenko. . . 740 



The relation of humidity to the ripening and storage of fruits, Shamel 741 



Statistics of fruits in principal countries, Ruddiman 741 



Minnesota State Fruit-Breeding Farm in 1916, Haralson 741 



