HEMATITE. LIMONITK. 



43 



dipped in a solution of acetate of lead, sulphate of sil- 

 ver, and caustic potassa; the first absorbs the sulphuric 



Fig. 4. 



acid, the second absorbs the combinations of hydrogen 

 with phosphorus and arsenic, and the last thecarburet- 



Fig. 5. 



