42<> EXPERIMENT STATION RECORD. 



two modifications of the Avery-Beans method of determining total 

 arsenic in Paris green, recommended for adoption last year, were made 

 official, as was also the thiosulphate method of determining copper. 



In a supplementary paper the referee reported the results of some 

 investigations showing the rapidity with which bleaching powder loses 

 chlorin upon standing, largely due to the chemical changes taking 

 place within the product itself. 



The results of a study of the lime-sulphur-salt-soda wash, carried 

 out along the same lines as recent investigations on the lime-sulphur- 

 salt wash (E. S. R., 17, p. 55), were presented in a paper Iry J. K. 

 Haywood. The two washes were found to decompose in the same 

 manner, except that the rate of decomposition of the lime-sulphur- 

 salt-soda wash was much slower. By substituting soda for lime, the 

 author has prepared, in laboratory experiments, an insecticide which 

 does not require boiling in its preparation and which corresponds, so 

 far as chemical changes are concerned, to the lime-sulphur wash and 

 which he recommends for practical trial. The proposed formula is as 

 follows: Water 20 gal., powdered sulphur 7f lbs., and caustic soda (98 

 per cent) 4 lbs. The salt was not found to enter into the changes 

 taking place in this material. 



FOODS AND FEEDING STUFFS. 



Neither the referee, J. O. La Bach, nor the associate referee, J. K. 

 Haywood, presented reports upon this subject. 



C. A. Browne, jr., recommended that a committee be appointed by 

 the association for the purpose of establishing standards for the com- 

 position of various unmixed feeds, such as wheat bran, rice bran, cot- 

 ton-seed meal, etc. By vote of the association this matter was referred 

 to the committee on food standards. Doctor Browne also recom- 

 mended that the method adopted by the Fifth International Congress 

 of Applied Chemistry for the analysis of molasses feeds be adopted 

 b}^ the association as an official method. Action on this recommen- 

 dation was deferred until next year. 



FOOD ADULTERATION. 



Brief remarks were made by the referee, W. D. Bigelow, on the 

 work as a whole. Reports of 12 associate referees which were pre- 

 sented are noted below. No reports were offered on the subjects of 

 w T ine, beer, vinegar, baking powder and baking chemicals, infants' and 

 invalids' foods, vegetables, condiments other than spices, and cocoa 

 and cocoa products, for wmich the association has associate referees. 

 The appointment of an additional associate referee on the determina- 

 tion of water was authorized. 



During a recess of the convention an informal meeting of food chem- 

 ists was held at which A. McGill demonstrated certain simple tests 



