river stages at river gage stations on the principal rivers of the United States for the 

 years 1893, 1894, and 1895. Part VI. Daily river stages at river gage stations on 

 the principal rivers of the United States for the years 1896, 1897, 1898, and 1899." 



A report on the underground waters of Louisiana, W. C. Stubbs, G. D. Har- 

 ris, A. C. Veatch, et al. ( Geol. Survey La. Bui. 1, p>p- VIII A- 164, pis. 10, Jigs. 12). — 

 This bulletin is divided into 2 parts, (1) the underground waters of southern Louisi- 

 ana and (2) the underground waters of northern Louisiana and southern Arkansas. 

 The work on the underground waters of Louisiana was begun by the State Geological 

 Survey in 1899, and earlier reports on the subject have already been noted (E. S. R., 



14, p. 428; 16, p. 722). 



The first part of this bulletin is substantially a reprint of Water Supply and Irri- 

 gation Paper No. 101 of the U. S. Geological Survey (E. S. R., 16, p. 722). It deals 

 with origin of artesian and deep-well waters in southern Louisiana, topography and 

 stratigraphy of the region, subdivisions based on underground water conditions, well 

 statistics, variations in flow and pressure head shown by wells in southern Louisiana, 

 well drilling, and pumping. 



The second part of the bulletin is a preliminary report on work carried on in 1902 

 and 1903 in Louisiana and adjoining States by A. C. Veatch, partially in the employ 

 of the Louisiana State Survey and partly as assistant geologist to the U. S. Geological 

 Survey. It gives a summary of the main results obtained in a study of the topog- 

 raphy, stratigraphy, geological formations, and water horizons of northern Louisiana. 

 A dictionary of altitudes in the same region is given in an appendix. 



On the influence of summer rains on the flow of springs, Houllier (Compt. 

 Rend. Acad. Sci. [Paris], 141 (1905), No. 23, pp. 972, 973; abs. in Rev. Sci. [Paris'], 

 5. ser., 4 {1905), No. 25, p. 783). — This article discusses briefly the various factors 

 which modify the relations between the rainfall and the flow of springs, such as the 

 permeability of the soil, temperature, and movement of winds, cultural conditions, 

 etc., of the basin feeding the springs. 



Water softening- at Oberlin, Ohio, W. B. Gerrish (Engin. Rec, 52 (1905), No. 



15, pp. 412, 413; abs. in Jour. Amer. Chem. Soc, 27 (1905), No. 12, Rev., p. 676, 

 677). — A water-softening plant in which sodium carbonate and calcium hydroxid are 

 used to remove hardness, due to carbonates and sulphates of calcium and magnesium, 

 is described. 



The sterilization of water by ozone, A. Steens (Engin. Rec, 53 (1906), No. 1, 

 pp. 31, 32, figs. 4)- — This article describes the system proposed by Marmier and 

 Abraham, in which water to be sterilized is passed through a vertical cylinder filled 

 with concentrated ozone in such a way as to secure a thorough mingling of gas and 

 water. The method is claimed to be very efficient. 



Purification of water by copper sulphate, D. D. Jackson (Municipal Engin., 

 29 (1905), No. 4 , pp. 245, 246; abs. in Jour. Amer. Chem. Soc, 27 (1905), No. 12, Rev., 

 p. 675). — An account is given of the successful use of copper sulphate, 1 part in 

 2,000,000 of water, to remove algal growths in ponds. 



In experiments with Bacillus coli communis and B. typhi abdominalis it was found 

 that 1 part of copper sulphate to 50,000 parts of water was required to kill the germs 

 when fresh and virulent, One part of the sulphate in 1,000,000 of water will greatly 

 attenuate the germs and render them much less harmful in time of typhoid epidemics. 

 One part in 2,000,000 of water destroys the germs with the attenuation usually found 

 in water. One part in 50,000, and even 1 part in 1,000,000, can, however, be detected 

 by taste and might affect the consumer. 



A new method for detecting pollution of drainag-e water, water of streams, 

 and drinking water, L. Heim (Osterr. Chem. Ztg., 8 (1905), No. 22, p. 521).— An 

 asbestos filter which has been successfully used for removing suspended matter from 

 water so that the colorimetric determinations may be more accurately made is 

 described. 



