In \iew of tilts general revision of the methods, as now contem- 

 plated, all members of the association and others interested are urged 

 to call attention to any inaccuracies or inconsistent statements which 

 come to their notice. The 1906 meeting of the association will proba- 

 bly occur at an earlier date than usual and prompt action is necessary. 



W. D. BlGELOW, 



Chief) Division of Foods. 

 WASHINGTON, D. C., April g 4, 1906. 



I. MEAT AND MEAT PRODUCTS. 

 (All page references are to Bulletin 65.) 



Twentieth Convention, 1903., Bui. 81, Cir. 13. 



The method for precipitation by bromin alone and by bromin in the 

 filtrate from zinc sulphate was discontinued. 



This action eliminates from the methods the following paragraphs 

 in Bulletin 65: Page 11, (e) Determination of proteoses, peptones, 

 and gelatin, (1) First method; page 18, (e) Determination of proteoses, 

 peptones, and gelatin; and page 19, (g) Determination of peptones. 



Twenty-first Convention, 1904, Bui. 90, Cir. 20. 

 The following methods were adopted as provisional: 



EXAMINATION OF MEAT EXTRACTS. 



Ammonia. By the magnesium oxid method, as described in Bulletin 46, page 21. 



Acidity. Titrate with standard alkali solution, using litmus paper as an indicator. 

 The solution may advantageously be removed from the beaker and placed on the 

 litmus paper by means of a capillary tube. 



Phosphorus. The organic matter should be destroyed by one of the methods given 

 in Bulletin 46, page 12, and phosphoric acid determined by either the gravimetric or 

 volumetric molybdate method described in Bulletin 46, pages 12 and 14. 



Chlorin. Determine chlorin by titratioii with sulphocyanid, according to Volhard. 

 For ordinary purposes the solution of the ash may be employed. More exact 

 results may be obtained by dissolving about 1 gram of the meat extract in 20 cc of a 

 5 per cent solution of sodium carbonate, evaporating to dry ness, and thoroughly 

 igniting. The residue is then extracted with hot water, filtered and washed, after 

 which the filter and contents are returned to a platinum dish and ignited. The 

 contents of the dish are then dissolved in nitric acid, added to the filtrate, and th6 

 chlorin content determined as indicated above. 



II. EDIBLE OILS AND FATS. 

 Twentieth Convention, 1903, Bui. 81, Cir. 13. 



Page 26, just preceding U 5. Determination of Saponification 

 Number, etc." (under "4. Determination of lodin Absorption, etc.") 

 insert the Hanus method as a provisional optional method. (See 

 additions for 1905 for text of method then made official.) 



