I'Jl'O] CONTENTS. HI 



Page, 



riidspborite, superphosphate, and totiapliospliate, Quartaroli 029 



rhospliorlc acid utilization in Bavaria, Fisciier 629 



Kaw rock phospliate r. acid i)ii(>spiiate, Cain (J30 



Pota.sh from l<elp. — II, Distillation at low temperatures, Spencer 6^^ 



Experiments with sodium chlorid and potassium salts, Christensen 630 



Lime in 1918, LouKhlin and Insk-y 630 



Value of late glacial drift as linung material, von Feilitzen and Nystrom_ 631 



Analyses of fertilizer liy the department of agriculture i'tn- 1919 631 



[Fertilizer inspection work for the spring of 19201 631 



The fertilizer control law and how to comply with it, Proulx 631 



AGBICULTUKAL BOTANY. 



The prohlems of experimental heredity, Blaringheni _ 632 



The genetics of VninixtnuUi carpatica, I'ellew 632 



Relation between number of chromosomes and types in Lathyrus, Winge_ 632 



Double flowers jiiid sex-linkage in Begonia, Bateson and Sutton 632 



The presence of iodin in plants, Wintersteiu 632 



Behavior of organic substances in phints. X, Ciamician and Itavenna 6.32 



Rutin, tiavone pigment of Esrli-scholtzid caUfoniica, Sando and Bartlett 632 



Carotin and xanthopbyll content of green and autumn leaves, Goerrig — 633 



Exudation of water by Colocasid (uitiqiiontiii. Flood 633 



Concentration of electrolytes in the leaf sap of Si/rinf/a iuUj<trin, Mason__ 633 



Existence of daily growtli rings in the cell wall of cotton hairs, Balls 633 



Artificial budding of roots, Molisch 634 



Old age in perenidal plants, [Benedict] 634 



Studies in the metabolism of actinomycetes. — III. Nitrogen, Waksnian 634 



Studies in metamolisni ot actincjuiycetes. — IV, Waksman and Joffe 635 



Plant hygiene, Gough 635 



Inventory of seeds and plants imported from April 1 to June 30, 1916 635 



FIELD CROHS. 



[Report of field crops work in Louisiana, 1919], Kidder et al 635 



I Report of field croi)s work at Duluth Substation, 1918-19], Thompson 636 



[Report of field crops work in Nebraska] 637 



(Rei)ort of field crops work in Nigeria in 1917], Rae and Thornton 637 



(Report of field crops work in Nigeria, 1918 1, Thornton and Renwick 637 



CJrowing irrigated grain in southern Idaho. Aicher 637 



Improvement of Rhodesian pastures, Mundy 638 



Culture tests with root crops, 1917-1919, Helwig 638 



Oil see<l plants, Wacker 638 



Seed studies: Red clover with reference to country of origin, Stapledon 638 



The corn crops. Montgomery 638 



Guam corn, Briggs 038 



Forage for the cotton belt, Tracy 638 



Interim report of the Empire Flax fJiowing Comnnttee 639 



Experiments with Kherson and Sixty-Day ojits. Warburton and Stanton_ 639 



Oats in Michigan, Cox 639 



Seed potato preparation, Hibbard 639 



Soy beans, Megee 639 



Sudan grass, Vinall 639 



Sweet clover seed. Coe and Martin 640 



Essays on wheat, Buller 640 



Wheat investigatiims. — I, Pure lines, Zinn 611 



[The necessity for increase<l wheat production in Victoria] 642 



The bread value of wheat. Sanderson 642 



A modified Boerner sampler, Boerner and Ropes 642 



Report on proposefl electrolytic treatment of seeds before sowing. Russell. 642 



{Report of the Official Seed Testing Station of England and Wales] 642 



HORTICULTURE. 



Cooperation in and coordination of investigational work. Corbett 642 



Methods of approach to horticultural problems. Hooker 642 



Some indirect methods in extension horticulture, Cardinell 643 



