Temporary Mounts and Microchemical Tests 79 



treated with barium chloride, crystals of calcium sulphate become 

 covered with a granular layer of barium sulphates while crystals of 

 calcium oxalate are not affected. 



Calcium carbonate, when treated with hydrochloric acid or 

 acetic acid, dissolves with effervescence. The acetic acid should be 

 rather dilute. 



