186 EXPERIMENT STATION RECORD. [Vol.43 



as far as possible, and that the use of side ditches be avoided where it is 

 possible to drain into the adjoining fields. The opinion that organic matter in 

 soils used for highway construction is detriruental is contradicted. 



Strengthening a county bridge to carry motor-truck traffic, M. Goodkind 

 {Enr/in. Ncuys-Rec, SJf {1920), No. 13, pp. 611, 618, figs. 3).— The strengthening 

 of two higliway bridges having capacities of only 4 and .5 tons, respe<:tively, by 

 reinforcement with auxiliary channels, eyebeams, truss rods, and stiffener 

 angles, is outlined. This resulted in increasing the capacity of both bridges 

 to 12 tons at 16,000 lbs. unit stress. 



Public Roads (U. S. Dept. Agr., Public Roads, 2 (1919), No. 20, pp. 56, figs. 

 10). — Tills number of this periodical contains the following articles: Papers 

 and Discussions at the Highway Officials' Convention ; The American Highway 

 Problem, by A. R. Hirst ; Survey of Southern States Highway Situation, by W. 

 S. Keller ; Highway Situation in the Pacific Coast States, by H. Nunn ; New 

 England Road Conditions, 1919 and 1920, by W. D. Sohier; The Situation in 

 the Middle Atlantic States, by S. Knopf ; Highway Situation in Central Western 

 States, by F. R. White; The Motor Vehicle's Share in Highway Construction 

 and Maintenance Cost, by S. E. Bradt ; Problems of Administration — Proper 

 Cooperation between Adjoining States, by A. H. Blanchard ; Is State Super- ■> 

 vision of Construction and Maintenance of all Highways Desirable? by B. 

 H. Piepmeier; Proper Inspection in Development of Material Supplies for 

 Heavy Programs, by A. B. Fletcher; Highway Department and Railroad Coop- 

 eration for Transportation of Materials, by A, G. Gutheim ; Statement Sub- 

 mitted by the Highway Division of the Associated General Contractors, by 

 R. G. Collins ; Surveys and Plans and Suggested Changes to Meet the Shortage 

 of Engineers, by P. St. J. Wilson ; Relations with the Contractor — Infiuence 

 of Fair Specifications and Inspection, by H. S. Mattimore ; Pennsylvania's 

 Lackawanna Trail, by A. C. Rapelje; and Federal-aid Project Approvals and 

 Agreements, November, 1919. 



Asphalt and allied substances: Their occurrence, modes of production, 

 uses in the arts, and methods of testing, H. Abraham {New York: D. Yan 

 Nostraiiit Co., 1918, pp. XXV-\-606. figs. 208).— This treati.se deals with the fab- 

 rication, merchandising, and application of bituminous products. It embraces 

 (1) methods serving as a guide for the works chemist engaged in testing and 

 analyzing raw and manufactured products, (2) data, for use in blending and 

 compounding mixtures, and (3) the principles imderlying the practical use 

 of bituminous products for structural purposes of interest to the engineer, 

 contractor, and architect. 



Concrete: How it is made {Concrete Utilities Bur. [PampJilet], No. 2 [1919], 

 pp. 16, figs. 7). — Brief popular information is given on the selection of materials 

 for proportioning, mixing, and placing of concrete. 



AVaterproofing engineering, ,T. Ross {New York: John ^YiIey d Sons, Inc., 

 1919, pp. 10-\-Ii42, figs. UfO). —In this book an effort is made to explain past and 

 present methods and materials of waterproofing, to report investigations of 

 their efficiency, and to establish standard methods and materials for general 

 waterproofing. The value of a careful study of the whole subject of water- 

 proofing by engineers is emphasized. The following chapters are included : 

 Need and function of waterproofing, systems of waterproofing, impervious 

 roofing, waterproofing expansion joints in masonry, waterproofing materials, 

 AVaterproofing implements and machinery, technical and practical tests on 

 waterproofing, waterproofing specifications, practical recipes and special for- 

 nmlas, waterproofing applied, cost data on materials, implements, and labor, 

 and practical tables. 



