314 EXPERIMENT STATION RECORD. 



means of perchloric acid according to Schloesing, in the form of double chlorid of 

 platinum potassium, and by the method of Corenwinder and Contamine (E. S. R., 

 9, p. 416) ; the determination of nitrogen in different forms, including organic nitro- 

 gen by means of soda lime in fertilizers rich and poor in nitrogen but containing no 

 nitrates, by the method of Grandeau in substances which are difficult to mix and 

 pulverize, in all three forms in a mixed fertilizer, and by the Kjeldahl method, 

 ammonia in ammonium sulphate by the Schloesing apparatus, ammonia in a complex 

 fertilizer, and nitric acid in nitrates by the Schloesing method; the determination 

 of phosphoric acid in different forms, including natural phosphates of lime, pre- 

 cipitated phosphates, guanos, poudrettes, etc. ; the determination of phosphoric acid 

 by the molybdic method, of soluble phosphoric acid in superphosphates and chemi- 

 cal fertilizers, phosphoric acid in sulphuric acid solutions, the degree of fineness of 

 phosphates, and the examination of phosphatic slags. 



Gladding's method for phosphoric acid, J. B. Coppock (Chem. News, 77 {1898), 

 No. 2009, p. 242). — This is a comparison of the magnesia and Gladding 1 methods on 

 boiled bones and superphosphates. In the tests made there was a very satisfactory 

 agreement between the results obtained by the two methods. Although somewhat 

 higher percentages were obtained by the Gladding method, the author concludes 

 that the Gladding method is reliable enough for fertilizer work and has the advan- 

 tage of being very rapid. 



Determination of phosphorus in steel, iron, and iron ores, J. Oiily {Chem. 

 Neios, 7G {1897), No. 197S, p. 200). 



Volumetric estimation of combined sulphuric acid, F. Telle {Jour. Pharm. et 

 Chim., 6. set:, 7 {1898), No. 4, p. 165).— The sulphuric acid is precipitated with barium 

 chlorid after acidulating with hydrochloric acid ; the excess of baryta is precipitated 

 with potassium bichromate, and finally the excess of chromate is estimated, by the 

 iodin displaced, by sodium thiosulphate. — is. n. iiite. 



On Fehling's solution, O. Rosenheim and P. Schidrowitz {Chem. News, 76 {1897), 

 No. 19SS, p. SIS; 1907, p. 97).— A reply to a paper by Jovitschitsch- and Siegried. 3 

 The authors maintain that alkali sales of mineral acids (hydrochloric, nitric, and 

 sulphuric) do not possess the property of reducing Fehling's solution. — is. h. hite. 

 A quick polarimetric method for the estimation of starch in flour, etc., E. 

 Dowzajrd {Chem. News, 77 {1898), No. 1998, p. 107).— One gram of the Hour is mixed 

 with a little cold water, 35 cc. of boiling water added, the mucilage kept at 100 for 

 -A- minute, cooled to 48 , and treated with 20 cc. of a 10 per cent malt-extract solution 

 that has been shaken with kaoliu and filtered. The mixture is kept at 48° for 20 

 minutes, brought just to boiling, and filtered. The cooled filtrate is made up to 100 

 cc, a small quantity of kaoliu added, filtered again, and the optical rotation taken 

 in a 20 cm. tube. The optical rotation of the malt-extract solution and of the dex- 

 trin in the Hour must be deducted. — B. H. iiite. 



The estimation of carbohydrates (sugar, starch, and dextrin) in foods and 

 condiments by a simple method, F. GROMMES {Die Bestimmung der Eohlehydrate 

 {Zucker, Starke, Dextrin) in beliebten Ndhrungs- und Genussmittehi vermittels einer leicht 

 ausfiihrbaren Meihode. Inaug. Diss., Erlangen, 1897, pp. 178; abs. in Hug. Rundschau, 

 8 {1S98), No. 11, pp. oJO, 551). — This is a full account of work reported above (p. 311). 

 The different methods of determining the quantity of starch in cereals, P. 

 Biourge {Bid. Assoc, ficole Superior de Brasserie Univ. Louvain, 1S98, No. 1). 



On testing for diastase from barley, P. Terkat {Jour. Pharm. et Chim., 6.ser.,6 

 {1897), No. 11, p. 494). 



A note on the detection of maize starch and maize flour in mixture with 

 wheat flour, E. E. Ewell {Jour. Appl. Micros., 1 {1898), No. 6, pp. 100, 101). 



i Jour. Amer. Chem. Soc, 18 (1896), p. 23 (E. S. R., 7, p. 650). 

 sBer. Dent. Chem. Gesell., 30 (1897), p. 2435. 

 » Ibid., p. 3133. 



