1916] EUEAL ENGINEEEING. 83 



Geology and water resources of Siilphur Spring Valley, Arizona, O. E. 

 Meinzek and F. C. Kelton { Arizona Sta. Bid. 72 (1913), pp. 231, pis. 15, figs. 

 32). — This is a reprint of U. S. Geoolgical Survey Water-Supply Paper 320 

 (E. S. R., 30, pp. 18, 85). The publication previously noted as Bulletin 72 of 

 the Arizona Station (E. S. R., 32, p. 513) constitutes one chapter of the present 

 publication. 



The Ohio water problem, C. E. Sheeman {Ohio State Univ. Bui. 20 {1915), 

 No. 10, pp. 135, pis. 6, figs. 19). — "This bulletin is directly the result of two 

 lectures, one given in the engineering and one in the university lecture course 

 at Ohio State University in January, 1913, and January, 1914, respectively. 

 The subject of the first was river and harbor improvements, and of the second 

 the Ohio water problem." The following chapters are included: Preliminary 

 considerations, floods, flood-protection plans, economics of water transporta- 

 tion, broader aspects of water transportation, water power, miscellaneous uses, 

 Sandusky-Scioto conservancy, and a state-wide survey. Maps and tabular 

 and graphic data are included. 



Flood protection in Indiana, W. K. Hatt {Proc. Ind. Acad. Sci., 1914, pp. 

 149-156). — This is a brief review of the findings of the Indiana Flood Com- 

 mission, appointed to study flood causes and flood-prevention methods in In- 

 diana. 



Report from the water laboratory, H. E. Barnakd {Ind. Bd. Health, Ann. 

 Rpt. Chcm. Div. Lab. Hijg., 9 {1014), PP- 155-163, figs. J).— Of the 1,645 sam- 

 ples of w^ater analyzed during 1914, 702 were collected from so-called shallow 

 wells, 656 from deep wells, 96 from streams, 84 from springs, 48 from cisterns, 

 27 from lakes and ponds, and 32 from miscellaneous sources ; 1,342 of these 

 samples were from private supplies, mainly private wells, wdiile 303 samples 

 were from public supplies. 



Of the total number examined, 1,021 waters w^ere reported as good, 414 as 

 bad, and 210 as doubtful. Of the private water supplies examined, 509 were 

 from deep wells, 684 from shallov/ wells, 48 from cisterns, and 69 from springs ; 

 767 of all the private samples examined were potable, 381 were condemned as 

 bad, and 194 w'ere classed as doubtful. Of the 509 deep wells analyzed, 426 were 

 furnishing good water, 36 were reported as bad, and 47 as doubtful. Of the 684 

 shallow wells, but 246 furnished potable water, while 308 were unqualifiedly 

 bad, and 130 were doubtful. Of the 48 cistern waters, 22 were good, 21 bad, 

 and 5 doubtful. Of the 69 spring waters, 49 were good, 10 bad, and 10 doubtful. 

 These results are taken to indicate that the shallow well as a source of private 

 water supply is greatly to be feared. 



Limits of potability of the waters of the Province of Buenos Aires, F. A. 

 Mazza {An. Soc. Quim. Argentina, 3 {1915), No. 10, pp. 167-183). — Data on the 

 maximum tolerable chemical lijpits of potability of the waters of different parts 

 of the Province of Buenos Aires, as determined bj' local surroundings and con- 

 ditions, as M'ell as by analyses, are reported. 



Sewage treatment and disposal, B. J. Ashley {Farm Implements, 30 {1916), 

 No. 1, pp. 70, 72). — In a brief statement of the fundamental principles of the 

 desigff of small sewage treatment and disposal systems, special attention is 

 drawn to the importance of the colloidal media for aerobic organisms in nitrifi- 

 cation systems and to the existence and action of colloids in sewage as important 

 factors affecting design. 



Activated sludge method in England {Municipal Jour., 40 {1916), No. 6, pp. 

 199, 200). — Recent experiments at Salford, England, on duration of aeration, 

 winter operation, and possibility of continuous flow led to the conclusion " that 

 it would be perfectly practicable to reduce the aeration to one hour." It is also 

 thought that "where only domestic sewage is treated the time of aeration 



