32 DEPARTMENT OF AGRICULTURE GEORGIA. 



emetic, which is formed by its union with potash and tar- 

 taric acid. 



Barium occurs usually as sulphate of barium, when it is 

 called heavy spar, because of its weight. It is largely used 

 to adulterate white lead. 



Bromine is a dark, reddish liquid, of no general impor- 

 tance, except in combination with potassium, as "bromide 

 of potassium. 



Bromide of magnesium and sodium is found in certain 

 mineral springs. 



Chromium is a metal occurring chiefly with iron and oxy- 

 gen, as chrome iron ore. It is used not only in the forma- 

 tion of several salts of the drug stores, as chromate and 

 bi-chromate of potash and of lead, but very largely in the 

 green coloring matter known as chrome green. Green- 

 backs are colored with it. 



Cobalt is a metal of no special importance. The name 

 has sometimes been given to a fly poison, which is very 

 dangerous, being chiefly metallic arsenic. 



Copper is found as a metal in nature, but more frequently 

 combined with some other element, as oxygen and sul- 

 phur. It enters into many of the useful alloys, chief 

 among which is brass. Its important salt is the sulphate 

 or bluestone. 



Verdigris, or the acetate of copper, which is poisonous, 

 is formed when fruits or acid vegetables are boiled in cop- 

 per vessels. Copper forms other salts with different acids. 



The test for copper in its ore is to bring it into solution 

 with nitric acid and add ammonia. The solution will ap- 

 pear deep blue, should copper be present. 



Lead is usually found as galena, which is a combination 

 of lead and sulphur. It is obtained pure from its ore by 

 means of furnaces. It is used not only pure, but in a 

 large number of alloys. It is slightly soluble in well and 

 spring waters,. 



