632 



INFLUENCE OF FOOD PKESEEVATIVES ON HEALTH. 



and positive in the preservative period. The general effect of the 

 preservative in this case is to distinctly decrease the quantity both of 

 nonmetabolized and metabolized sulphur excreted. 



SUMMARY. 



Combining the data for the nine men in one expression for each 

 period the following general results are obtained: 



TABLE XVI. Sulphur summary, by periods, for nine men, Series VI. 



It is seen that the balance is negative in all cases, being smallest in 

 the preservative period and largest in the after period. The general 

 tendency of the preservative seems to be to diminish very slightly the 

 excretion of nonmetabolized sulphur that is, the quantity appearing 

 in the feces and to increase the quantity but decrease the percentage 

 of metabolized sulphur, that is the sulphur appearing in the urine. 

 These changes are so slight that it may be said that sulphur metabo- 

 lism is practically unaffected by salicylic acid, as far as these data 

 show. 



In regard to the apparent irregularity of a negative balance in the 

 fore period especially, it may be stated that the methods which are in 

 common use by anatysts for determining organic sulphur that is, 

 sulphur existing principally in foods are not so complete as the 

 methods for determining inorganic sulphur. All the modern methods 

 and precautions for securing the whole of the organic sulphur were 

 observed during the anatytical operations, but there is probably still 

 sufficient difficulty in the methods of sampling and analysis to account 

 for the slightly irregular results indicated by the above data. 



