Ml EXPERIMENT STATION RECORD. 



To avoid these errors the author uses the following method: Add ammonia to the 

 solution freed as thoroughly as possible from ammonium salts until calcium phos- 

 phate just begins to separate; redissolve the precipitate with a drop of hydrochloric 

 acid, heat the solution to boiling and pour slowly into a mixture of equivalent 

 amounts of ammonium oxalate and oxalic acid; then add ammonia not stronger 

 than 1 per cent, drop by drop, until the solution is alkaline, and complete the 

 determination in the usual manner. 



Investigations on the determination of caustic lime in burnt lime and the 

 solubility of calcium carbonate in ammonium nitrate solution, G. Bek.ii' and 

 W. Kosinenko {Landw. Vers. Slut., 60 (1904), No. 5-6, pp. 419-425).— \X was found 

 that Bodenbender and Ihlee's ammonium-nitrate method gives accurate results 

 when the mixture of carbonate and oxid contains 8 per cent or more of the latter. 

 Shake •'! »o 5gm. of the substance, according to the amount of carbonate present, in 1 

 liter of fifth-normal ammonium nitrate for :! hours in a rotary apparatus making -JO 

 revolutions per minute, and determine lime in the usual way in an aliquot of the 

 subsided solution. 



The examination of -waters and water supplies, J. C. Thresh {Philadelphia: 

 P. Blakiston'8 Sou A- ('<>., 1904-, pp. A" 17 • 460, pis. 19, figs. 11). — This book is based 

 very largely on the author's own observations and investigations. It lays special 

 stress upon the importance of a more careful examination of the sources from which 

 waters are derived, the microscopical and biological examination of suspended mat- 

 ter in addition to the ordinary bacteriological examination, and more complete chem- 

 ical analyses than those ordinarily provided for. 



The work is divided into three parts, dealing in detail with the examination of 

 the sources from which water is derived (shallow and deep wells and springs, sur- 

 face water supplies, rivers and streams, service reservoirs, mains, etc. ); various 

 methods of examining waters and the interpretation of the results (objects and 

 methods of analysis, and interpretation of the results of physical, chemical, micro- 

 scopic and biological, and bacterioscopic examinations); and analytical processes 

 and methods of examination (collection of samples of water, chemical and physical 

 examination of water for sanitary purposes, estimation of the saline constituents, 

 determination of the gases dissolved in water and evolved therefrom, analysis of the 

 sinter deposited by water, analyses of waters from various geological sources, and 

 bacteriological, microscopic, and biological examination of water). 



Notes on the determination of nitrogen as nitrites in -waters, R. S. Weston 

 (.huir. Amer. Chem. Soc, 27 (1905), No. 3, pp. 281-287). — Experiments are reported 

 which hear out I losvay's claim that the substitution of acetic acid for hydrochloric 

 acid in the Griess-Warington method increases its rapidity and delicacy. 



The volumetric determination of carbon dioxid, F. Schulze (Ztschr. Landw. 

 Versuchsw. Oesterr., 8 (1905), No. 1, pp. 70-72). — The author describes a method in 

 which the carbon dioxid generated is collected over concentrated calcium chlorid 

 solution in a Schulze-Tiemann nitric acid apparatus. 



Combustible compounds in the air, H. Wolpert (Arch. Hyg., 52 (1905), X". 2, 

 )>/>. 151-178, fig. 1). — From an extensive series of investigations the author concludes 

 that outdoor air contains incompletely oxidized carbon compounds, the proportion 

 in Berlin being at least 0.015 volume per 1,000, which is about 4.5 per cent of the 

 carbon content of the air. The air in rooms when pure contains the same amount 

 of these carbon compounds as the outer air. Products of combustion of illuminating 

 gas and respiratory products increase the proportion of incompletely oxidized carbon 

 compounds markedly. 



Physical chemistry in the service of agriculture, F. K. Cameron (Jour. Phys. 

 (In in., 8 ( 1904), A'o. 9, pp. 637-647; abs. in Chem. CentbL, 1905, I, No. 6, p. 464) — 

 A paper read before the physical chemistry section of the International Congress of 

 Arts and Science at St. Louis in 1904. It cites a number of examples of ways in 



