ADVERTISEMENTS. 
a 
World Life. A study of the formation, growth and decay of 
Lei Haman Cod A critical 
exposition. By —s OHN pre Rar = a 289 pp. Regu 
The American Geologist for 1891, 
EDITED BY 
Pror. S. Catvry, University of Iowa; Dr. E. W. a Buchtel College; Joun — Lafayette College; - 
Dr. PERSIFOR Frazer, Fema Institute; Pror. F. W. hoon Washburn College; Pror. C. L. Hexnice, 
Cincinnati Unive E A. Lanes, Colorado School of Mines; De. ANDREW Chine wson, late 
gical Survey of comune; 0. Ue snag = Geological Survey; Pror. I. C. Wurte, 
Uni 
versity of Bajas k Virginie: Dr. ‘ia: WINCHE ofp tron y of Michigan ; 
F. N. H. Win eins, Ca a a ROA a. 
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