SOME CHEMISTRY OF EVERYDAY LIFE 



199 



scattered through sand and rocks has often been mistaken 

 for gold, and is frequently referred to as " fool's gold." 



The tonnage passing through the "Soo" Canal connecting 

 Lake Superior and Lake Huron far exceeds that through the 

 Suez Canal, or any other of the great water ways of the 

 world. Much of this traffic is ore from the northern Minne- 



FIG. 65. A freight carrier on the Great Lakes. 

 Chamber of Commerce.) 



(Courtesy of Duluth 



sota region en route to the blast furnaces of the lake ports of 

 Milwaukee, South Chicago, Detroit, and Cleveland, and 

 (by rail) to Pittsburgh one of the world's greatest centres of 

 iron and steel manufacture. Return cargoes of coal for the 

 upper lake region swells the tonnage volume of this enormous 

 lake traffic. 



The manufacture of iron and steel is so vitally connected 

 with national life and prosperity, and a general understanding 

 of operations involved in producing commercial iron is so 

 readily acquired, that information concerning its sources and 



