126 



CHEMICAL PHYSIOLOGY. 



phates is frequently found coating other calculi. This occurs 

 when the urine becomes ammoniacal, hence in such cases regard 

 must always be had to the condition of the urinary mucous 

 membrane. Such calculi are incombustible, but, when exposed 

 to a strong heat, fuse into a white enamel-like mass, hence the 

 name, fusible calculi. 



8. (B.) Group. 



(i.) The substance gives the murexide reaction, indicates urate.-s. 

 The residue is treated with water. 



It is soluble, and { Neutralise ; add platinic chloride, a \ _ p j 

 the solution is < _ yellow precipitate . . . . \ ~ 

 . f" 



alkaline, 



The residue yields a yellow flame 



= Sodium. 



/Ammonium oxalate gives a white \ 

 Scarcely soluble ; I crystalline precipitate . . . / 

 the solution is | Ammonium oxalate gives no precipi-\ 



i 



= Calcium. 



ammonum 



scarcely alka-< tate, but on adding 



line ; soluble in I chloride, sodic phosphate, and am- > = Magnesium. 



acetic acid, . I monia there is a crystalline precipi- 1 



\ tate of triple-phosphate . . . / 



(ii.) The original substance does not give the murexide test. 

 Treat the original substance with hydrochloric acid. 



It dissolves with effervescence 



( Calcic carbonate. 

 \ Magnesic carbonate. 



= Calcic oxalate. 



j- = Triple phosphate. 



= Neut. calc. phosp. 



= Acid calc. phosp. 



9. General Examination of the Urine. 



(i.) Quantity in twenty-four hours (normal 50 oz., or 1,500 cc.) 



(ii.) Colour, Odour, and Transparency (if bile or blood be sus- 

 pected, test for them). 



