136 LABORATORY WORK IN PHYSIOLOGICAL CHEMISTRY. 



2. AMORPHOUS TYPE. 



(a) Earthy Phosphate. Dissolves in acetic acid without 

 the development of gas. 



(6) Earthy Carbonate. Dissolves in acetic acid with effer- 

 vescence. 



(c) Calcium Carbonate. Dumb-bell shape. Soluble in 

 acetic acid, with an escape of gas. (Compare Calcium 

 Oxalate.) 



SCHEME FOR IDENTIFYING SEDIMENTS. 



On heating the sediment on a platinum foil it 



Does not char. 



Does char. 



