10 EXPERIMENT STATION RECORD. 



After the precipitate lias settled, allow the solution to cool to not above 

 room temperature, and when cold, add to it slowly and with constant stirring 

 8 cc. of the 20 per cent sodium acetate solution. Allow the solution and pre- 

 cipitate to stand in a cool place from 4 to 18 hours, filter in the cold, and wash 

 with a 1 per cent ammonium oxalate solution until free from chlorids. Dry 

 the precipitate and incinerate with the filter paper in a platinum crucible. 



To the filtrate obtained above add 20 cc. of concentrated nitric acid, 

 evaporate almost to dryness, and when no more nitric acid fumes come off add 

 10 cc. of concentrate hydrochloric acid and again evaporate nearly to dryness. 

 Dilute the residue to about SO cc. nearly neutralize with ammonia, and cool. 



If iron is absent add sufficient sodium acid phosphate (slightly in excess) 

 and ammonium hydroxid. until the solution is alkaline, and finally enough of 

 the latter to make one-fourth of the total liquid. Allow the solution to stand 

 over night, collect the precipitate, and wash free from chlorids with alcoholic 

 ammoniacal solution (1 part of alcohol, 1 part of dilute ammonium hydroxid, 

 and 3 parts of water). Dry the filter and the precipitate and incinerate with 

 a good supply of air. 



If iron Is present precipitate it with sodium citrate before the magnesium is 

 lirecipitated. 



A titrametric method for carbon dioxid, A. Vesterberg {Ztschr, Flnjs. 

 Chem., 10 {}!>10). jip. .j.'jl-oGS, figs. 2). — On the basis of Kuster's work, Wink- 

 ler's method was rearranged and applied to the determination of carbon 

 dioxid in distilled water, carbonates, mixtures containing carbonates, and in 

 natural waters (both as to free and half-combined carbon dioxid and the free 

 carbon dioxid and carbonate hardness of a water). 



Pohl's m^ethod for determining the melting' point, A. Halla {Osterr. Chcm. 

 Ztg., 13 (1910), No. 3, p. 2D).— The cause for the differing results obtained by 

 various investigators is ascribed to the fact that in some of the cases a ther- 

 mometer with a pear-shaped mercury bulb was employed. In order to get 

 accurate results with this method the author states specifically that a globe- 

 shaped bulb must be used. 



A modified method for determining the saponification number, E. Rupp 

 and F. Lehmann (Apoth. Ztg., 24 {1909), No. 10',, pp. 972, 973; ahs. in Ztschr. 

 Riech M. Geschmackst., 2 {1910), No. 4, p. ){). — In this method the saponifi- 

 cation Is performed In a stoppered bottle, whereby the loss by evaporation is 

 practically excluded and the apparatus employed is simplified. 



Separation of saccharose and lactose by the Bulgarian ferment, L. Mar- 

 GAiLLAN iCompt. Rend. Acad. Sci. [Paris], 150 {1910), No. 1, pp. //-J-',?'). — The 

 author was able to confirm the conclusions of Bertrand and Duchacek, that 

 with the Bulgarian ferment it is possible to ferment practically all the lactose 

 without attacking the saccharose. The possibility of emploj'ing this method in 

 the analysis of condensed milk is mentioned. 



Methods for estimating cellulose, M. Renker {Ztschr. Angexo. Chem., 23 

 {1910), No. 5, pp. 193-198). — Eighteen methods for determining cellulose were 

 investigated. The materials used were jute, sulphite cellulose, wood, and 

 cotton. 



From the results the author concludes that a modification of Cross and 

 Bevan's chlorination method (E. S. R., 13, p. 916) yields the best results. The 

 method dissolves little real cellulose and does not include the lignin in the 

 estimation. 



Cause of low results in glycogen analysis with dilute alkali, G. Francke 

 {i'ber die Ursachen, Weshalb die Glykogcn Analyse hci Anwendung Vcrdiinntrr 

 KalUaugc ze Niedrige Werte Geliefert Hat. Inaiig. Diss., Univ. Bern. 1909. 

 pp. 37). — Concentrations of from 1 to 2 per cent of alkali do not change or 



