RURAL ENGINEERING. 885 



The regulation of rivers, J. L. Van Oknum {Nexo York, and London: McGraiv- 

 Hill Book Co., 1914, PP- X+393, pis. 6, figs. 96; rev. in Engin. News, 7^ (1915), 

 No. 25, p. 1170). — This book considers the principles underlying the regula- 

 tion of rivers. It contains chapters on commercial considerations, general 

 phenomena, investigations, surveys, etc., methods of river improvement, the 

 principles of regulation, worlis of channel contraction, the protection of erodible 

 banks, dredging, levees, and the control of the current. 



Proceeding's of the eleventh annual meeting" of the Iowa State Drainage 

 Association (Proc. lotca State Drainage Assoc, 11 {1915), pp. Ill, figs. 5). — 

 The following special articles are included in these proceedings : 



Platting and Recording Tile Drainage Systems, by C. B. Piatt ; Soil Erosion, 

 by B. Brooks ; Planning and Building Farm Drainage Systems, by F. O. Nelson ; 

 Draining and Farm Units, by J. M. Wells ; Drainage by Wells, by J. T. Stewart ; 

 Soil ]Moisture — Under Drainage and Crop Production, by W. J. Schlick ; Drain- 

 age Improvements and Their Relation to Sanitary Conditions, by L. Higgins; 

 Some Sanitary Benefits Resulting from Drainage, by W. Grant ; Problems of 

 Drainage Contractor, by H. B. Whitney ; Legal Problems in Operating Under 

 the Iowa Drainage Law, by T. P. Harrington ; The National Aspect of Drain- 

 age, by E. T. Perkins ; Levying Drainage Assessments, by G. R. Campbell ; and 

 Methods of Paying Drainage Engineers for Their Services, by A. G. Baker. 



Proceedings of seventh anniial drainage convention of the North Caro- 

 lina Drainage Association, 1914, compiled by J. H. Pratt and Miss H. M. 

 Beeky {N. C. Geol. and Econ. Survey, Econ. Paper 41 {1915), pp. 10, figs. 3). — 

 These proceedings contain the following special articles : 



The Upbuilding of Eastern Carolina Through Drainage and the Resulting 

 Benefits to the Railroads, by B. E. Rice ; Tile Drainage, by W. E. Slierwin ; 

 The Importance of Principles of Farm Drainage, by H. M. Lynde ; The Drain- 

 age and Development of North Carolina's Muck Lands, by C. W. Mengel ; 

 North Carolina Drainage Law and Some Needed Amendments, by J. H. Small ; 

 and Some New Factors in Drainage Work in North Carolina, by L. Brett. 



The hydraulic ram, B. B. Robb {Cornell Countryman, 13 {1916), No. Jf, pp. 

 275-281, figs. 7). — The construction and operation of single- and double-acting 

 hydraulic rams are illustrated and described, and tlie results of performance 

 tests of a typical ram operating under fixed heads, but with varying lengths of 

 stroke of the dash valve, are graphically reported. The mathematical theory 

 of the operation of the hydraulic ram is also briefly presented. 



Electrically driven dragline scrapers dig 45-mile irrigation canal {Engin. 

 Rec, 73 {1916), No. 5, pp. llfl, UiS, figs. 3).— Data on unit costs of excavating 

 1,500,000 cu. yds. of material in two seasons with two machines on the Sun 

 River project of the U. S. Reclamation Service are given. 



A comparison between bleach and liquid chlorin disinfection, C. R. A\'ery 

 {Ann. Rpt. Prov. Bd. Health Ontario, 33 {1914), PP- 142-149). — Experiments 

 are reported comparing bleaching powder and liquid chlorin for the disinfection 

 of water. 



The results are taken to indicate that " taking the results as a whole the 

 advantage of what difference there is seems to lie with the bleach. This dif- 

 ference is small, however, and the conclusion is that if a normal water supply 

 be treated with the same amount of available chlorin, whether from bleaching 

 powder or liquid chlorin, and provided proper mixing takes place, the disin- 

 fection in either case will be the same." 



Does alum inhibit the action of chlorin as a disinfectant? C. R. A^^:RT 

 and O. G. Lye {Ann. Rpt. Prov. Bd. Health Ontario, 33 {1914), pp. 150-155).— 

 Experiments on the effect of alum on the action of chlorin as a disinfectant 

 for water are reported. 



