414 EXPEEIMENT STATION RECORD. 



analysis that is of no importance to the entomologist. It was suggested 

 that much of the matter of minor importance in the work of the ref- 

 eree as reported ])e eliminated in order to lighten the labor of his suc- 

 cessor. With this moditication it was recommended that the methods 

 reported be continued. 



The report on arsenical insecticides was made b}^ the associate 

 referee, J. K. Haywood. The work of determining arsenic in Paris 

 green was reviewed, and reasons given for choosing the methods tested. 

 These were the sodium acetate method, as the best at the present status 

 of the analysis of Paris green for finding the arsenic content, and 

 the water-extraction method for showing to some extent the stabil- 

 ity of Paris green, as giving an idea of its action in orchard prac- 

 tice. But few results were reported. The associate recommended 

 that the above methods be adopted provisionally, and further tested 

 during the coming \"ear. 



L. L. Van Slyke stated that in analyzing Paris green it should be 

 borne in mind that arsenic in soluble form is injurious to foliage, when 

 present ])eyond certain amounts. The method adopted should apply 

 to the question of determining the danger from the application of 

 arsenic to foliage. In the speaker's laboratory a 10 per cent mixture 

 in water is made of the Paris green, and if, after 24 hours, the amount 

 of arsenic in solution is insufficient to damage foliage, the product is 

 considered all right. J. K. Haywood stated that the soluble arsenic 

 present does not go into solution under 24 hours. The result more 

 closely approximating its action in practice is its stability as deter- 

 mined by its contact with water. 



The sodium-acetate method for the determination of the arsenic con- 

 tent of Paris green, and the water-extraction method for showing the 

 stability of Paris green, were adopted as provisional methods, and the 

 association directed further investigation along these lines. No formal 

 recommendations were made in regard to cyanid and formalin, but the 

 referee was instructed to test the cyanid process for estimating the 

 latter. 



MISCELLANEOUS. 



The report of the abstract committee was made by E. W. Allen. 

 The work during the past 3^ear was outlined, which consisted of the 

 publication of abstracts of methods of analj^sis, prepared by the mem- 

 bers of the committee, in this journal. As this abstracting can be 

 followed up by the force in the Office of Experiment Stations, the 

 work was turned over to that Office and the committee discharged. 



In view of the fact that the object of the committee on volumetric 

 standards had been accomplished in the establishment of the Bureau 

 of Standards, that committee was discharged. The report of the com- 

 mittee on food standards, defining the meaning of terms, was made by 

 W. Frear. 



