686 



EXPERIMENT STATION RECOBD. 



[Vol. 35 



ties, owing to a better adhesion of tlie bituminous material by a partial surface 

 impregnation of the rock." 



The following table " may be used as a general guide for minimum limits of 

 French coefficient of wear and toughness in connection with bituminous broken- 

 stone roads." 



Minimum limits of physical tests of rock for bituminous-road construction. 



Construction and maintenance of earth roads, L. V. Edwards {State Col. 

 Wash., Dept. Ext. Bui. 20 (1916), pp. 35, figs. 29).— This bulletin is intended to 

 give some suggestions to road supervisors and others interested in improved 

 roads as to how to construct and maintain earth roads. The subjects dealt 

 with are grading, grades, widths, drainage, and maintenance. 



Brick roads, V. M. Peirce and C. H. Moorefield {U. S. Dept. Agr. Bui 373 

 (1916), pp. 40, pis. 12, figs. 4).— A revision of Bulletin 246 (E. S. R., 33, p. 686). 



Rules and regulations of the Secretary of Agriculture for carrying out 

 the Federal Aid Road Act. D. F. Houston (U. S. Dept. Agr., Office Sec. Circ. 

 65 (1916), pp. 24).— The text of the act (E. S. R., 35, p. 200), and of the rules 

 and regulations, is given. 



Factors of apportionment to States under Federal Aid Road Act appro- 

 priation for the fiscal year 1917 (U. S. Dept. Agr., Office Sec. Circ. 62 (1916), 

 pp. 2). — This circular presents the factors of apportionment and the amounts 

 apportioned to each State for the fiscal year 1917 under the Federal Aid Road 

 Act. 



Fifth, sixth, seventh, and eighth annual reports of the state roads com- 

 mission [of Maryland] for the years 1912—1915 (Ann. Rpts. State Roads 

 Com. Md. 5-8 (1912-1915), pp. 175, pis. 22).— This reports the activities and 

 expenditures of the commission for the years 1912-1915. 



Report of the State Highway Department of Washington for the period 

 October 1, 1912, to October 1, 1914, AV. R. Roy (Rpt. State Highway Dept. 

 Wash., 1912-1914, PP- 192, figs. 42). — This is an outline of the various phases 

 of work undertaken by the Washington Highway Department, together with a 

 survey of highway conditions in the State and practical suggestions and in- 

 formation. 



Bridge foundations, W. Btjrnside (New York: D. Van Nostrand Co., 1916, 

 pp. VIII-\-139, figs. 32). — This book deals with foundations for abutments and 

 piers of bridges crossing rivers or other waters. 



" The different kinds of foundations in common use and the methods by 

 which they are placed in position are described. The conditions suited to each 

 kind are noted and where necessary and possible the principles of design are 

 indicated. Next to nothing, however, is said with regard to cost and in ref- 

 erence to plant." 



The subject matter includes chapters on the foundation bed, abutment 

 foundations, pier foundatlon.s, piled foundations, dams, screw piles and screw 



