Nitrogen in Urine. 



381 



Table 200. Ratio of total solids and organic matter to nitrogen in urine in 

 metabolism experiments icith and icithout food Continued. 



In experiments Nos. 59 and 68, only the average for the experiment is 

 given as the determinations were made on the composite urine. In the other 

 experiments, the determinations were made daily. The ratios range from 3.124 

 on the third day of experiment No. 71 to 5.353 on the first day of experiment 

 No. 80. The average of all the experiments without food is 3.784. Comparing 

 the individual days with this average ratio, the variations are in general very 

 slight. The comparison shows even a greater uniformity in the ratios for the 

 averages of the different experiments. The lowest average ratio is 3.254 in 

 experiment No. 69 and the highest 4.886 in experiment No. 77. 



The experiments on S. A. B. show that save in the case of experiment No. 77, 

 the ratio is fairly constant. The two experiments with A. L. L. show similar 

 uniformity. There is an unusually high ratio, 4.886, in experiment No. 77, 

 which marks it as distinct from all the others. 



Ratio of Organic Matter to Nitrogen. 

 The presence of varying amounts of ash and especially sodium chloride in 

 the total solids of the urine would cause marked variations in the ratios of 

 total solid matter to nitrogen. The nitrogen of urine is present in the organic 

 matter and not in the ash of the urine, and hence if the ash be deducted from 

 the total solids, the ratio of organic matter to nitrogen would be expected to be 

 more nearly constant. Here again the ratio for experiments Nos. 59 and 68 

 are given only for the average per day for the whole experiment. The lowest 

 ratio of organic matter to nitrogen is 2.646 on the second day of experiment 

 No. 79. The highest ratio, 3.969, is found on the last day of experiment No. 77. 

 For each gram of nitrogen^excreted, there is on the average 3.017 grams of 

 organic matter. The ratio of organic matter to nitrogen is, therefore, much 

 more nearly constant than that of total solid matter to nitrogen. 



