544 INFLUENCE OF FOOD PKESEKVATIVES ON HEALTH. 



to nitrogen in the preservative period. The ratio of phosphoric acid 

 to nitrogen remains unchanged. The tendency to reduce the magni- 

 tude of the ratio of sulphur to nitrogen is maintained in the after 

 period, whereas there is no further diminution of the magnitude of 

 the ratio of sulphuric acid in that period. The ratio of the phosphoric 

 acid, however, is very markedly increased in the after period. A 

 general review of these data indicates that the administration of the 

 salicylic acid tended to increase the relative excretion of sulphur to 

 nitrogen, and that this tendency was continued in quite a marked 

 degree in the after period. There is scarcely any effect produced by 

 the salicylic acid upon the relative quantities of sulphuric acid and 

 nitrogen excreted. There seems to be a marked tendency on the part 

 of the preservative to produce a condition which diminishes the rela- 

 tive amount of phosphoric acid to nitrogen excreted, but this full effect 

 is not shown until the after period. 



In general, it may be said that the disturbing influence upon the 

 relative quantities of these bodies excreted as compared with nitrogen 

 is not very great, but that there is a marked tendency to disturb in a 

 measurable degree the relative metabolic changes which the sulphur 

 undergoes in relation to nitrogen as determined by the constitution of 

 the urine. 



