DETECTION OF THE BASIC ELEMENTS. 143 



ter, add ammonia in excess to the clear and cooled 

 filtrate, filter again if this reagent produces any 

 precipitate, add liydric disodic phosphate to the 

 filtrate, agitate the mixture vigorously, and set it 

 aside for several hours if no precipitate appears at 

 first. A white crystalline precipitate appears, 

 that, if formed slowly, adheres to the sides of the 

 tube ; with the magnifying glass, and usually with 

 the unassisted eye, the crystals are seen to be slen- 

 der prisms. Magnesium. 

 Finis, 



