130 • EXPERIMENT STATION RECORD. 



about 1 inn. of calcium in very small crystals. The residue of argon is measured over 

 mercury in an apparatus similar to that of Regnault and Sehloesing. In the deter- 

 minations reported the proportion of argon varies from 0.9305 to 0.9492 per cent. 



Conversion tables for calculating fertilizer and feed-stuff analyses, II. B. 

 McDonnell {Maryland Agr. Col. Quart., 1904, ZVb. 24, I 1 !'- 16). — This is a reprint of 

 tables first published in Bulletin 30 of the Maryland Station, the tables for potash 

 having been recalculated, using the revised official factor for K 2 from K 2 PtCl 6 . 



The valuation of feeding stuffs, T. Pfeiffer {Mitt. Landw. Inst. Univ. Breslau, 

 2 {1903), No. 2, pp. 257-271). — A method of calculating the value of feeding stuffs, 

 taking into account their nianurial value. 



Investigation of the bodies called fiber and carbohydrates in feeding stuffs, 

 with a tentative determination of the components of each, 1'. Schweitzer 

 {Missouri Sta. Rpt. 1903, pp. 8-26). — Previously abstracted from another source (E. 

 S. R., L5, p. S4S). 



A comparison of the halogen absorption of oils by the Hiibl, Wijs, Hanus, 

 and Mcllhiney methods, L. M. Tolman {Jour. Amer. Chan. Soc, 26 {1904), No. 7, 

 pp. 826-837). — This is a brief account of work previously noted from another source 

 (E. S. R., 15, p. 438). 



The determination of water in substances that are to be afterwards 

 extracted with volatile solvents, R. M. Bird {Jour. Amer. Chem. Soc, 26 {1904), 

 No. 7, pp. 818-826, pi. l,fig. 1). — An apparatus devised for the purpose of avoiding 

 the transferring of butter from the drying dish to the extraction apparatus is 

 described and illustrated. While devised for use in butter analysis, the method is 

 also applicable to various other substances, and is believed to be as accurate as the 

 official method of the Association of Official Agricultural Chemists, and to require 

 much less time. 



Contribution to the question of Gottlieb or Adams, L. F. Rosengren {Rev. 

 Gen. Lait, 3 {1904), No. 15, pp. 337-344). — The experimental work of the author 

 agrees with results published by others, that when milk has been subjected to 

 considerable agitation, as in churning, marked differences are found in the deter- 

 mination of fat by the Gottlieb and Adams methods. 



Two theories have been advanced to explain this result, namely, that the small 

 fat globules are encased in dried casein, which prevents their extraction by ether, 

 and that other substances than fat are extracted. The author holds to the former 

 view. The fat obtained from a large number of samples analyzed by the Gottlieb 

 method was collected and dissolved in ether, the insoluble matter amounting to 0.002 

 to 0.004 per cent of the original milk. This residue was found to' be very different 

 from the nitrogenous material obtained by Storch from cream by repeated washing 

 with water and centrifuging. 



The residue was found to consist almost entirely of lecithin, while in the material 

 obtained by the method of Storch the nitrogen content varied between 11 and 14 per 

 cent. The material obtained by the method of Storch is, therefore, not believed to 

 be the cause of the higher results obtained by the Gottlieb method. 



The cryoscopy of milk, J. Winter and E. Parmentier (Rev. Gen. Lait, 3 {1904), 

 Nos. 9, pp. 193-200; 10, pp. 217-224; 11, pp. 241-247; 12, pp. 268-274) .—An extended 

 study was made of the application of cryoscopy to the examination of milk. Histor- 

 ical notes are given and the technique of the method employed is described. Numer- 

 ous determinations of the freezing point of pure and adulterated or modified milk 

 are reported. Cryoscopy is believed to have many practical applications in the 

 examination of milk and in the prevention of adulteration. 



Determination of citric acid in milk, M. Beau {Rev. Gen. Lait, 3 {1904) , No. 17, 

 pp. 385-396). — The author reviews the literature relating to the presence of citric acid 

 in milk and describes a modified method used by him, based upon the oxidation of 

 the citric acid by potassium permanganate and the precipitation of the resulting 



