CONTENTS. Ill 



Page. 



Experiments with crude ammonia, Bargeron 628 



rroduetion of sulphate of ammonia 629 



Formation of ammonia by the electric spark, Briner and Mettler 629 



The electro-thermic combustion of atmospherics nitrogen, Howies 629 



On the combustion of air, Kuss 630 



A new system for the fixation of atmospheric nitrogen, Savorgnan di Brazza. . 630 



The utilization of peat with the recuperation of by-products 630 



Peat in the United States 630 



Florida rock and other phosphates for land fertilization, Thackara 630 



Phosphate deposits in the Southern States, Brown 630 



The mineral industry during 1906, edited by Ingalls 630 



Commercial fertilizers, Burd 631 



Report on commercial fertilizers, 1907, Jenkins and Street 631 



Analyses of commercial fertilizers and Paris green, Halligan 631 



Fertilizer inspection. Woods and Bartlett 631 



Inspection of commercial fertilizers. Street et al 632 



AGRICULTURAL BOTANY. 



Nature and development of plants, Curtis 632 



Causes determining the distribution of plants, Marechal 632 



Factors affecting the seasonal activities of plants, MacDougal 632 



The internal temperature of leaves under tropical insolation, Smith 632 



The relation of phanerogamic parasites to nitrates, INIirande 632 



Association of Fseudomonas radiclcola with Bacillus ramoxus, Sackett 633 



Relation of certain biological principles to plant breeding. East 633 



Degeneration in potatoes, Massee 633 



Report of assistant in botany. Winters 634 



FIELD CROPS. 



A successful Alabama diversification farm, Crosby, Duggar, and Si)il]man 634 



A successful southern hay farm, Benton 635 



Forage crop experiments, Billings 635 



The Essex field experiments, 1906, Bull and Kirkham 636 



Field experiments at Lauchstadt, Schneidewind et al 637 



Experiments on the Poltava field from 1886 to 1905, Tretyakov et al 639 



Wagga experimental farm [report] , McKeown 640 



The time of farm operations at Aas Agricultural College, Holtsmark 640 



A contribution to the knowledge of the germination of grains, Effront - 640 



A hyl)rid from teosinte and corn, De Vilmorin 641 



Brewing barley from a scientific and practical standpoint, Bauer 641 



Cotton fertilizer experiment, Blair 641 



Manuring of seeds hay, Allan 641 



Irrigation of meadows, Stodolski 641 



Tests of lime nitrogen in comparison with nitrate of soda on hops, Wagner 641 



The hardness of the seed coats in Leguminoste, Hiltner and Kinzel 642 



Pentosans in the soy bean, Borghesani 643 



Sugar-cane experiments in the Leward Islands, 1905-6, Watts et al 643 



Cultivation of tobacco in Hawaii, Smith and Blacow 643 



Improvement of Virginia fire-cured tobacco, McNess et al 644 



HORTICULTURE. 



Report of the horticulturist, Warren and Voorhees 644 



Report of the botanist, Halsted and Owen 646 



Pollination of forced tomatoes, Fletcher and Gregg 646 



Japanese mushroom growing. Miller 647 



Fruits and early vegetables in southern Tunis, De Mazieres.. (547 



Field investigations in pomology, Powell 647 



Fruits for ( Jeorgia, Starnes and IMonroe 648 



Commercial fruit growing, Troop and Woodbury 648 



Annual report of wine-making station of Haro for 1906, De Ziiniga: 648 



Heeleaka Experimental Station. Investigations, Mann and Hutchinson 648 



Experiments in heavy pruning in Assam, Mann 650 



Variations produced among roses, Daniel 650 



