LETTER OF TRANSMITTAL. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF CHEMISTRY, 

 Washington, D. C., August 15, 1907. 



SIR: I have the honor to transmit for your approval the results 

 of the investigations which have been made in this Bureau to deter- 

 mine the effects of sulphurous acid and sulphites upon digestion and 

 health. The work is a continuation of that reported in Parts I and II 

 of Bulletin 84, dealing respectively with boric acid and borax, and 

 salicylic acid and salicylates, and I recommend that this investigation 

 be published as Part III of that bulletin. 



The plan of the experiment .is practically the same as that followed 

 in the previous reports. The more elaborate study of sulphur metabo- 

 lism, which was of special importance in this investigation, was made 

 by Mr. F. C. Weber, who also conducted the hygienic table. Mr. 

 W. D. Bigelow had charge of the general analytical work on the foods 

 and feces. Mr. B. J. Howard made the microscopical examination 

 of the blood and urine. The Bureau of Statistics, as in the previous 

 investigations, rendered valuable aid in the compilation of the 

 analytical data, a work of great magnitude. 

 Respectfully, 



H. W. WILEY, 



Chief of Bureau. 

 Hon. JAMES WILSON, 



Secretary of Agriculture. 



HI 



179202 



