METEOROLOGY WATER. 513 



meuts, aud tbe office methods of computing the regimeu of flow." The work 

 is based maiuly ou the hydrologic iuvestigatious of the U. S. Geological Survey. 



On the regim^e of the streams of the dry region of Northern Brazil, O. A. 

 Derby {Bol. Dir. Agr. BahUi, 9 {1901), No. .{, pp. .W-'z-S'/.t).— Measurements of 

 stream flow for a series of years are recorded. 



The drought antidote for the northwest, or the utilization of the artesian 

 resources of New South Wales, P. Allan {[Si/dney, 1906], pp. 95, pis. 8, figs. 

 36, dgms. 3, maps .'/). — This publication discusses in some detail the conditions 

 necessary for the occurrence of artesian water, and the location, extent, and 

 character of the artesian basin in Australia, and more particularly in New 

 South Wales, and gives data regarding the wells bored under the provisions 

 of various legislative enactments. The machinery aud methods used in drilling 

 artesian wells aud the methods of utilizing the water are described. 



Of the 412 artesian wells recorded the 130 bored by the government are 

 capable of irrigating with present works over 2,000,000 acres of land. " When 

 it is remembered that, in addition to the 2,027,534 acres referred to, there are 

 280 private bores watering large tracts of country, besides public watering-place 

 bores, the immense value of the artesian supply can be readily grasped, more 

 especially as without an efficiently distributed water supply, a great portion of 

 this arid, or semiarid, portion of the State could not be profitably occupied." 



The water of the Oder Valley, Luedecke (Das Wasser des Odertales und die 

 Wasscrkalaiiiitdt der Stadt Brcslau. Leipsic, 1901, pp. 36, figs. //). — Chemical 

 studies of the quality of the water of the Oder River at different periods and 

 stages and of the ground water and springs of the valley are reported, as well 

 as an examination of the sources of contamination and means of removal. 



Clean water and how to get it, A. Hazen {New York and London, 1901, pp. 

 VI -r lis pis. l-'t). — "This little volume deals with the means now used by 

 American cities to secure clean water, and with the application of these means 

 to new problems. Some closely allied subjects are also touched upon, including 

 some matters of general policy, pressure, aud fire service, the sale of water, 

 and the financial management of waterworks." 



Different chapters treat of impounding reservoir supplies, water supplies from 

 small lakes, the Great Lakes, and rivers, ground-water supplies, the action of 

 water on iron pipes and the efl'ect thereof on the quality of the water, develop- 

 ment of water purification in America, aud the nature of the methods of puri- 

 fying water. 



The disinfection of sewage effluents for the protection of public water 

 supplies, K. F. Kellerman, R. W. Pratt, and A. E. Kimberly ( V. aS'. Dept. Agr., 

 Bur. Plant Indus. Bui. 115, pp. 41). — This bulletin reports experiments made 

 in cooperation with the Ohio State Boai'd of Health with the copper sulphato 

 treatment of sewage effluents at St. Mary's of the Springs, Westerville, the Boys' 

 Industrial School, Lancaster, and Marion, Ohio, and with the chlorin treatment 

 at the Boys' Industrial School, and at Marion. 



The importance of the destruction of pathogenic bacteria in sewage effluents, 

 especially when the sewage is discharged in the vicinity of shellfish l)eds or 

 when town and city water supplies are menaced with contamination, is 

 discussed. 



The results reported show that — 



" Both calcium hypochlorite and copper sulphate have high germicidal values 

 when acting upon partially pui'ified sewage. Calcium hypochlorite is much 

 more rapid in its action, is more nearly able to bring about complete disinfec- 

 tion at a lower cost, aud is less influenced by temperature and by the presence 

 of carbonates. It is liable to deteriox'ation upon standing and is more disagree- 

 able and less convenient to handle than copper sulphate. 



