NOTES. 297 



more than It should. The methods given for Bordeaux-lead arsenate for the 

 electrolytic determination of copper worked very well when applied to Bordeaux- 

 Paris green. It was also found that the arsenious oxid could be easily deter- 

 mined by either the C. C. Hedges or C. M. Smith method. Water-soluble arsenic 

 varied from 3.92 to 4.92 per cent. The results for Bordeaux with lead arsenate, 

 moistui-e, carbon dioxid, lead, total arsenic, copijer, and water-soluble arsenic 

 agreed fairly well, considering the difficulties of analyzing a sample of this Iiind. 



The results for nicotin by the Chapin silicotungstic acid method (E. S. R.. 

 25, p. 36) agreed closely, and its adoption as an official hiethod was urged. 

 Some of the methods are to be further studied, but work on the Lloyd method 

 for nicotin determination is to be discontinued. 



W. W. Skinner, referee on water, gave an account of the work on the detenni- 

 nation of strontium, with special reference to why low results were obtained 

 in last year's work. The methods for strontium are to be .studied further. 



C. B. Williams, chairman of the committee on the availability of phosphoric 

 acid in basic slag, presented a report of progress. C. L. Alsberg, of the special 

 committee on the study of the vegetable proteins, reiwrted that this committee 

 was of the opinion that work in this difficult field of research should not be 

 begun until some means could be found whereby it could be conducted under 

 conditions that would assure its continuation for a sufficient length of time to 

 enable those engaged in the work to acquire skill and experience in the methods 

 of isolating and separating the proteins from one another and in the methods 

 used for studying their properties. 



J. Hortvet, referee on food adulteration, stated that several lines of investiga- 

 tions which were under way during the past two years have been either com- 

 pleted or the work has been so satisfactory that definite recommendations can bo 

 made for the final adoption of methods or for further study along well-defined 

 lines. The work of the various associate referees was then reviewed. 



W. E. Mathewson, associate referee on colors, reported on the coloring mat- 

 ters of a number of fruits, and gave a brief review of the literature pertaining 

 thereto and upon coal tar dye mixtures. 



The associate referee on fruits and fruit products, H. C. Gore, gave an 

 account of collaborative work on the estimation of malic and citric acids In 

 fruit Juices, and stated that a new basis for a method for estimating citric 

 acid has been found, in which the polariscoi>e is used and sodium molybdate is 

 the reagent. Methods for citric and malic acids are to be studied further. 



B. G. Hartmann, associate referee on wine, gave the results of studying 

 methods for determining tartaric acid in wine and grape .iuice. The figures 

 submitted by the various collaborators .showed that the method described in 

 Bulletin 107, revised, p. 86, is unreliable when phosphoric acid is present. The 

 association voted to study further the proposed method with regard to its use 

 for red wines, and also to study the effect of adding Rochclle salts instead of 

 tartaric acid as provided in the Hartmann and Eoff method. 



The method for determining phosphoric acid in beer by the addition of cal- 

 cium acetate and subsequent ashing was adopted as a provisional method 

 Instead of the direct volumetric determination with uranium acelate. A paper 

 on Maraschino cordials was presented by J. G. Riley and A. L. Sullivan. 



The associate referee on vinegar, E. H. Goodnow, rejKjrted on work done 

 with cider vinegar and with methods 6. 11, 15, and 17, as given in the 1911 

 proceedings of the association, and these method? were adopted provisionally. 

 Methods 10 and 20 are to be given further study. 



A report on flavoring extracts was given by the associate referee, A. E. Paul, 

 and a paper on the relationship between the alcohol-soluble solids* and ether- 

 soluble solids in st:indard ginger oxtriicts by C. W. Harrison and A. L. Sulliv.Tu. 



