257 



of the glass, and partly fall to the bottom, in the shape 

 of small bright red crystals. In the standard, after twelve 

 hours, nothing more observable, than the usual nubecula; 

 nor was there any sign of crystallization, or separation of 

 uric acid, even after twenty -four. 



EXPERIMENT II. 



To the same quantity of adult tirine, were added one 

 drachm and half of acetous acid^ which caused a more 

 copious separation and crystallizatiori of this substance, 

 with the foregoing appearances. None observable in the 

 standard after twenty-four hours. 



EXPERIMENT III. ' 



."•> - .Urjii uiijj'j io 



To four ounces of urine of a healthy child, who never 

 was observed to pass gravel, and of the usual degree of 

 acidity, was added one drachm of acetous acid, which 

 soon caused an evident and copious separation of crys- 

 tallized uric acid. The crystals were, however, not quite 

 so coloured ; the urine of children not being so much im- 

 pregnated with the ur6e, or colouring matter. No such 

 appearance in the standai'd after twelve hours or more. 



EXPERIMENT IV. 



To four ounces of adult urine, rendered very soon after 

 a tea breakfast, and nearly in a state of uri?ia potus, was 



added 



