URINARY DEPOSITS. 129 



solution apply the tests for dextrin and glycogen (Lesson II., 

 4, 5), reducing sugars, e.g., grape or milk sugars (Lesson II., 

 6). The former, in a concentrated solution, is precipitated 

 by absolute alcohol, the latter is not. If cane-sugar be 

 suspected, invert it (Lesson II., 9, d.), and test for a reducing 

 sugar. Test also for urea (Lesson XV., 4, 7). 



(g.) Ascertain its solubility in warm water, starch (Lesson 

 II., 1), urates (Lesson XVII. , 5), tyrosin (Lesson VIII., 5). 



(h.) Test for uric acid (Lesson XVII., 3). 



(i.) Cholesterin is insoluble in cold water and alcohol, but 

 soluble in ether. On evaporation of the ether, the character- 

 istic crystals are obtained (Lesson IX., 7). 



(j.) Fats melt on heating and are soluble in ether, leaving 

 a greasy stain (Lesson IV., 13). 



C. Analysis of Urine The student must also practise the 

 analysis of urines containing one or more abnormal constituents, 

 and he must also practise the estimation of the quantity of the 

 more important substances present. Both sets of processes must 

 be done over and over again, in order that he may perfect 

 himself in the methods in common use. 



