1917] CONTENTS. Ill 



Page. 



Effect of repeated growing of plants in nutritive solutions, Zhemchuzhnikov . . 631 



Influence of alkalinity of a solution on the nitrogenous material, Morozov 631 



Significance of potassium ion in synthesis of nitrogen compoimds, Stoklasa 631 



Role of calciuni carbonate in the assimilation of ammonia, Morozov 631 



Role of ammonia in transformation of nitrogenous material, Prianislinikov 632 



The formation of asparagin by Lupinus luteus, Nikolaeva 632 



The fixation of free nitrogen by certain fungi, Chambers 632 



A new case of symbiosis between a bacillus and a plant, Georgevitch 632 



The assimilation of carbon dioxid, Willstatter and Stoll 632 



Studies on chemical transformations in leaf of Diospyros kaki, Parrozzani 633 



On the assimilation of iron by plants, Sidorin 633 



Changes in potatoes during the resting period, Szell 633 



Changes in chemical composition of rye under influence of Fusariiim, Pomaekii. 633 



FIELD CROPS. 



Yields of spring grains in Illinois, Burlison and Allyn 634 



Grain drying, Bernstein 634 



Grading and baling Philippine fibers, Edwards 634 



One year of the fiber-grading law, Saleeby 634 



Description of the standard grades of Philippine fibers, Saleeby 634 



Fiber-grading stations and grading establishments, Saleeby 635 



Fiber production in the Philippine Islands during 1915, Saleeby 635 



Important legiunes. — I, Peas, vetches, beans, lupine, and lentil, Fruwirth 635 



Why alfalfa sometimes fails in Iowa, Jensen 635 



Flax culture in South Dakota, Hume, Champlin, and Martin 635 



Some varieties of Indian gram {Cicer arietinum) , Howard and Rahman IQian. . 635 



Cultural experiments of German Potato Culture Station, 1915, von Eckenbrecher . 636 



Cuttings for the propagation of potatoes, Kiessling 636 



Potato variety tests at Kloster Hadmersleben, Heine 636 



Methods and aims in potato breeding, Holdfleiss 636 



Solanum commersonii, the swamp potato, Siebert 637 



Sudan grass, Hutcheson, Hodgson, and Wolfe 637 



Maniurial experiments with sugar cane in the West Indies, Dunlop 637 



Sugar cane on the experimental fields. — Crops of 1914, Harrison et al 637 



Sweet clover. Parsons 637 



Sweet potato culture, Johnson and Rosa, jr 638 



The proportion of grain to straw in varieties of wheat, Pridham 638 



Selection plats. — A reminder to wheat growers, Pridham 638 



[Seed corrosion and its prevention], Molz 638 



The seed situation in Utah, Stewart 638 



The seed business in the first year of the war, Heinrich 638 



Clover and grass seed for spring sowing, 1916, Heinrich 638 



[Computing actual values of clover and grass seed], Heinrich 638 



Characteristics of quack grass and western wheat grass, Hiune and Sloan 638 



[The control of hedge mustard with finely powdered kainit], Schnitzler 639 



Weeds of New South Wales, Maiden 639 



HORTICULTURE. 



Gardeners' dictionary and instructor, Johnson, edited by Eraser and Hemsley . . 639 



The complete gardener, Thomas 639 



Garden planning and planting, edited by Thomas 639 



Gardening made easy, edited by Cook 639 



Kitchen and market gardening, Bussard 639 



[Overhead irrigation results in 1916], Palmer 640 



Cucumber growing, Halligan 640 



Commercial onion growing, Sayre 640 



The use of brine tank refrigerator cars for fruit shipments 640 



The relation of fruit growing to soil fertility, Thompson 640 



The Indiana farm orchard operating costs and methods, Woodbury et al 640 



On the cause of alternate bearing in the apple, Butler 640 



The identification and classification of pears, Luizet 640 



Origin and development of hardy, blight-resisting pears. Patten 641 



The cherry and its industrial cultiu-e, Hinzenberg 641 



Variations of a sexual hybrid of the vine, Baco 641 



