148 EXPERIMENT STATION. [Jan. 



niise that the phosphorus exists in the corn as phytin or a 

 similar organic compound, and that the latter may have been 

 decomposed in the process of evaporating the steep water. 



4. Pending further investigation, the acidity of gluten feeds 

 is believed to be due primarily to some form of phosphorus, to 

 a much less degree to the acid salt of suli)huric acid, as well as 

 to traces of sulfites and organic acids. It is advised that the 

 acidity be sufficiently neutralized so that no more than .5 per 

 cent, is shown (calculated as sulphuric acid) when titrated 

 against normal alkali with phenolphthaloin as indicator. 



5. The gluten feeds examined showed traces only of sulfites, 

 and hence it is concluded they are not present in sufficient 

 amount to be regarded as in any degree injurious to animals. 



6. About 80 per cent, of the gluten feeds collected in Massa- 

 chusetts during 1908 were found to contain aniline (coal tar) 

 dye. It is not believed that the amount present was sufficient to 

 be considered injurious. It is thought, however, that it would 

 be decidedly preferable to omit the color. 



In conclusion, the writer wishes to express his thanks to 

 Dr. J. B. Lindsey, Dr. R. D. MacLaurin and Mr. E. B. Holland 

 for their criticisms of the above-described work. 



