42 



NOTES AND COMMENTS BY THE COLLABORATORS. 



C. S. Brinton used the tables of Rota and others given by Allen, a Schultz and Julius, 

 "Organic coloring matters," and Circulars 25 and 35, Bureau of Chemistry. Consid- 

 erable difficulty was encountered in some cases in isolating color from fruit pulp and 

 sirup. Double-dyeing method was used for extracting color from material, and color 

 was obtained in aqueous solution by extracting wool with ammonia. Sample VI 

 gave considerable trouble, and definite report was not made. 



F. O. Woodruff used chiefly tables of Green, Yeman, and Jones, b also tables in 

 Allen and in Schultz and Julius, and Circular 35, Bureau of Chemistry. He says: 

 "Three difficulties attending identification are: (1) A commercial dye from different 

 manufacturers varies in purity and therefore in properties, though bearing the same 

 or a synonymous trade name; (2) amount of color on dyed fiber or in color solutions 

 affects the nature of the reactions therewith; (3) ordinary description of color reac- 

 tions varies with the observer and does not allow of fine distinctions." 



Hare, Mitchell, and Pringle used Rota's table and those in Circular 35, Bureau of 

 Chemistry. They comment as follows: "We find Rota's scheme quite valuable 

 in assisting us in the general classification of the dye. An accurate and complete 

 color chart would be a great aid, especially to those not used to making sharp color 

 distinctions." 



E. J. Shanley used the tables in Allen and Circular 35, Bureau of Chemistry. 



RECOMMENDATIONS. 

 It is recommended 



(1) That an effort be made to obtain authentic samples of vegetable or natural 

 coloring matters, such as are used in food products. This work should be assigned 

 to such men as are in a position to obtain authentic samples, for it is well-nigh impos- 

 sible for one person to obtain any considerable number of such samples and to ascer- 

 tain their source and method of preparation; 



(2) That characteristics of vegetable coloring matters and methods for identification 

 be studied ; 



(3) That synthetic preparations of pure colors for standards be made; 



(4) That the separation and identification of mixed colors be studied. 



The president announced the following appointments as members 

 of Committee A on recommendations of referees: R. J. Davidson, 

 J. P. Street, J. G. Lipman, B. L. Hartwell, and W. A. Withers. 



The association adjourned until 2 o'clock. 



THURSDAY AFTERNOON SESSION. 



REPORT ON MEAT AND FISH. 

 By F. C. WEBER, Associate Referee. 



In view of the fact that no work has ever been reported to the association on this sub- 

 ject , it seemed to the referee that some results showing the degree of accuracy of some 

 of the chemical methods ordinarily employed in separating protein nitrogen, and at 

 what point they show deterioration of meats, might be of interest . Owing to the nature 

 of the work and the difficulty of keeping samples uniform, no attempt was made to 

 secure collaborative work. 



SAMPLES. 



The determinations here reported were made on three samples of chicken meat. 

 Six young market chickens were obtained, killed, dressed, and allowed to stand in 

 the ice box over night. The next morning the flesh was separated from the bones 



"Commercial Organic Analysis, vol. 3, part 1. 

 *>Soc. Dyers and Colorists, 1905, 21: 236. 



