180 J. L. Smith—Corundum of North Carolina, etc. 
not pushed far enough to give results of much interest in this 
connection. 
Columbia College, July 11th, 1873. 
Art. XX.—Notes on the Corundum of North ‘Carolina, corgia, 
and Montana, with a description of the Gem variety of the Co- 
rundum from these localities ; by J. LAWRENCE SMITH, Louis- 
ville 
Tue corundum formations in North Carolina and Georg’ 
are the second in importance in the United States that have 
been brought to my notice; and the one in North Carolina 18 
by far the most interesting in this country, and perhaps of an, f 
yet known, in the extent of the formation, the distribution © 
the corundum, and the purity of the mineral. ‘ 
This mineral was first discovered in North Carolina in 1846 
—about the time I was engaged in developing the geology 
emery in Asia Minor and the Grecian Archipelago; and _ 
communicating to American geologists my discoveries 12 a 
tion to the associate minerals of the emery in Asia Minor, 
directing them to search for the same in connection with the 
corundum found in different parts of America, the same a 
ciates were discovered in connection with the North Carolina 
corundum as well as that from other localities. 
