1916] EUEAL ENGINEERING. 579 



Paper, 387 (1916), pp. 60+XXXIV, pis. 2).— This report, prepared in coopera- 

 tion witli the States of Colorado and New Mexico, presents the results of 

 measurements of flow made on streams in the Arkansas and Red River basins 

 during 1914. 



Surface water supply of New Mexico, 1914, J. A. French {Santa Fe, 

 N. Mex.: State Enyin. Dept., 191^, pp. 151, j)ls. ^).— This report, prepared in 

 cooperation with the U. S. Geological Survey, presents the results of measure- 

 ments of flow made on streams in the principal river basins of New Mexico 

 in 1914. 



Geology and underground water of Luna County, New Mexico, N. H. 

 Darton (U. S. Geol. Survey Bui. 618 (1916), pp. 188, pis. 13, figs, i.5).— This is 

 a more complete and detailed report of work previously noted (E. S. R., 32, 

 p. 384). 



Geolog'y and ground waters of northeastern Arkansas, L. W. Stephenson 

 and A, F. Ckider (U. S. Geol Survey, Water-Supply Paper 399 {1916), pp. 315, pis. 

 11, figs. 4). — This report describes the physiography and geology of north- 

 eastern Arkansas and discusses the occurrence and distribution of surface and 

 ground water by counties. A section, by R. B. Dole, on the chemical character 

 of the surface and gi-ound waters of the region is also included. 



Colorado River and its utilization, E. C. La Rue ( TJ. S. Geol. Survey, Water- 

 Supply Paper 395 {1916), pis. 25, figs. 5). — This paper gives the results of meas- 

 urements of flow made on the Colorado River and its tributaries and deals 

 with the utilization of the water for irrigation and power development pur- 

 poses. 



Physical properties of some toxic solutions, G. B. Rigg, H. L. Trumbull, 

 and Mattie Lincoln {Bot. Gaz., 61 {1916), No. 5, pp. 1(08-416). — Experiments 

 on the osmotic pressure and surface tension of (1) water obtained from sphag- 

 num bogs of the Puget Sound region and Alaska, and (2) solutions obtained by 

 allowing rhizomes of Nymphwa polysepala to decay in water are reported. 



It was found that " the osmotic pressure of bog water in the samples tested 

 was higher during the rainy season than at the close of the dry season. The 

 osmotic pressure of the waters tested from lakes and springs was lower during 

 the rainy season than at the close of the dry season. There is no indication that 

 either high osmotic pressure or low surface tension is an important factor in 

 the toxicity of bog water or of very dilute solutions resulting from the decay 

 of Nymphfea rhizomes." 



Tests of a new process of sewage purification with grease recovery and 

 apparent profit, R. S. Weston {Ainer. Jour. Pub. Health, 6 {1916), No. 4, pp. 

 334-343, fig. 1; abs. in Engin. News, 15 {1916), No. 19, p. 9i3).— Experiments 

 with Boston sewage conducted by E. S. Dorr and by the Massachusetts Insti- 

 tute of Technology are reported and compared. The process involves the addi- 

 tion of either sulphuric or sulphurous acid to the sewage to precipitate the bulk 

 of the solids in the form of a sludge which can be dried and degreased, the pur- 

 pose being to produce a greaseless fertilizer and to save the grease. 



From the experiments by Dorr it was concluded that each 1.000,000 gal. of 

 sewage would yield 1,361 lbs. of fertilizer base, " which was estimated accord- 

 ing to agricultural standards to be worth $13.59 a ton. 



The Massachusetts Institute of Technology experiments verified the results 

 with reference to the amount of sludge obtained from Boston sewage. The 

 results obtained were taken to indicate " that the sludge from the INIiles process, 

 although less in bulk than that from the activated sludge process, has a value 

 of more than $24 per million gallons of sewage." 



