SULPHUROUS ACID AND SULPHITES. 867 



MICROSCOPICAL EXAMINATION OF THE URINE. 



This examination includes the bodies enumerated in Table XII. 

 The numbers are interpreted by the following key, namely, = none. 

 1 = very few, 2 = few, 3 = fairly numerous, 4 = numerous, 5 = extremely 

 numerous. The method of procedure was that described in Part II, 

 page 574. 



URIC ACID CRYSTALS. 



No uric acid crystals are found in the case of No. 1 during the fore 

 period. They are numerous in the second part of the preservative 

 period, very few in the third part, and few in the after period. In 

 this case the formation of uric acid crystals was slightly greater in the 

 preservative period. 



In the cases of Nos. 2, 3, 4, 5, 6, 9, and 12 no uric acid crystals are 

 observed during any period of the experiment. 



In the case of No. 7 there are a very few in the fore period and at 

 the second test in the preservative period. 



For No. 8 there are very few found in the first test in the preserva- 

 tive period and at the close of the after period. 



In the case of No. 10 there are very few found in the fore period 

 and in the first part of the preservative period, and a few at the second 

 test in the preservative period. 



For No. 11 there are very few present in the second preservative 

 period only. 



With the exception of No. 1, therefore, it may be said that there is 

 no tendency shown on the part of the sulphurous acid to affect the 

 formation of uric acid crystals. 



The figures expressing the relative occurrence indicate a slight tend- 

 ency to increase the formation of uric acid crystals during the pre- 

 servative period, the figures for the three periods being 18.2, 31.4, and 

 22.7, respectively. 



URATES. 







No urates are found in any case during the whole period of obser- 

 vation. 



CRYSTALS OF CALCIUM OXALATE. 



In the case of No. 1 there are very few crystals found during the 

 first part of the preservative period, a few at the second test, a very 

 few during the last part of ^ie preservative period, a very few at the 

 first test in the after period, and a few at the close of the period. In 

 the case of No. 2 there are no crystals found except a very few in the 

 after period. 



a These examinations were made by B. J. Howard, chief of the microchemical 

 laboratory. 



11240 Bull. 84, pt 307 8 



