VIII CONTENTS. [Vol. 35 



Page. 



Irrigation management, Newell 491 



The cost of tile drainage on the Trumbull County experiment fann, Andrew.. 491 



Selecting types for a comprehensive county road system, Marr 492 



Recent developments in the building of concrete roads, Uhler 492 



Various aggregates in test concrete road, Connell 492 



A study of" cracks in a concrete roadway at Indiana University, Ilanna 492 



Concrete road construction in Oakland County, Michigan, De Glopper 492 



Second biennial report of Department of Public Roads of Kentucky, Terrell . . 492 



Annual report of the Baltimore County [Maryland] roads engineer, Sucro 492 



Coimtry roads board [Victoria], first annual report 493 



Recent road legislation of Iowa, edited by Sampson and MacDonald 493 



The la\v of Ohio governing roads and bridges, Rockel 493 



Experiments with dynamite. Watts 493 



Gravel as an aggregate for concrete, Schofield and Brown 493 



Amount of water to use in concrete, McCullough 493 



Maidng mortar impervious and anthracenic oil, Feret 493 



The influence of compression in internal-combustion engines, Mathot 494 



Some engine plow troubles and their remedies. Reed 494 



Recent inventions in machines for tilling the soil, CastelU 494 



Mechanical cultivating apparatus, Ringelmann 494 



( ulture machinery, Coupan 494 



Experiments on the draft of a model plow, Kiihne 494 



C omparison of team and tractor for hauling gravel, Kipp 495 



Knots and splices, ( harlton 495 



Barns for Wisconsin dairy farms, \ATiite and Griffith 495 



( onstruction of fresh air brooders, Upton 495 



"W inter storage of potatoes, Schaffnit 495 



Water problem simplified, Etherton 496 



RURAL ECONOMICS. 



What is agricultural economics? Nourse 496 



Economic cycles: Their law and cause, Moore 496 



^^ ages and rural migration , Beckerich 496 



Results of a survey of state marketing activities throughout United States 497 



/, ssociations for marketing meat in Germany, Horst 497 



The Grange in Canada, Michell 497 



C'hio agricultural statistics, 1914-15 497 



[Trade and commerce in agricultural products in Chicago], 1915 497 



Prices and supplies of gi'ain and other agricultural produce in Scotland 497 



Agricultural and Uve stock statistics of Finland 497 



Price statistics 497 



Supply of foodstuffs and prices in foreign coimtries during the war 497 



World's production of foodstuffs and raw materials, Schulte im Hofe 497 



Statistics of commerce of the French Colonies, 1913 497 



Review of the trade of India, 1914-15 498 



AGRICULTURAL EDUCATION. 



Graduate work in horticulture, Dorsey 498 



Required trips for horticultural students, Fagan 498 



Agricultural education in Indiana: Supervision of home project work. Smith.. 498 



Home education, Bombard 499 



The principles of plant culture, Goff 499 



( 'ourses in systematic vegetable gardening, Work 499 



Report of the committee on floricultural coiirses, Beal 499 



MISCELLANEOUS. 



Monthly Bulletin of the Ohio Experiment Station 499 



Monthly Bulletin of the Western Washington Substation 499 



