Claypole’s Chronology. 47 
1872 Resigned position in Bristol; came to America. 
1873. Appointed Professor of Natural History at Antioch Cotiege, 
Yellow Springs, Ohio. 
1881 Left Antioch. Appointed on staff of Second Geological Sur- 
vey of Pennsylvania. 
1883 Appointed Professor of Natural Science in Buchtel College, 
Akron, Ohio. 
1888 Received the degree D. Sc. from the University of London. 
Became one of the founders and editors of the “American Geolo- 
gist.” 
18¢8 Appointed Professor of Geology and Biology at Throop Poly- 
technic Institute, Pasadena, California. i 
EDITORIAL COMMENT. 
LAKE SUPERIOR IRON ORE DEPOSITS. 
Ten years ago the iron ore mined in the Lake Superior 
region was more than one-half the total product of the United 
States. Last year (1900) from this region alone came nearly 
three-fourths (19,121,393 long tons) of the total—an amount 
which exceeds the total annual product of any foreign coun- 
try. This ore is of higher grade than the average foreign 
ore. The Lake Superior region thus stands out preéminently 
as the most important iron ore district in the world. Because 
of its importance from an economic standpoint, as well as be- 
cause of the inviting opportunities it offers for geological in- 
vestigation, this region has been a favorite field of work for the 
geological surveys of Michigan, Wisconsin and Minnesota, 
and for the United States Geological Survey. The last organi- 
zation has undertaken a detailed study of the different districts, 
first under the direction of Irving, and, after his death, under 
the direction of Van Hise. The latter is especially well quali- 
fied to write concerning these iron ore deposits, for to him is 
due in large measure the credit for the solution of the compli- 
cated problems which surround the genesis of these ore bodies 
and the geology of the districts in which they lie. It is a pleas- 
ure to know that there has just appeared from his pen a valua- 
ble summary description and comparison of the different iron 
ore districts of the Lake Superior region.* 
*The iron,ore deposits of the Lake Superior region, by C. R. Van Hise 
21st Ann. Rept. U.S. Geol, Survey, part iii, pp. 305-434, pls. xlviii-lix, 1901 
