VI Contents 
JUNE NUMBER. 
A geological survey of the Concho country [map]. W. F. 
Cummins and Otto Lerch 321 
On the Maquoketa shales, and their correlation with 
the Cincinnati group of southwestern Ohio. [Illus- 
trated]. Joseph F. James 335 
The Lower and Middle Taconic of Europe and North 
America. [Illustrated]. Jules Marcou 357 
Crystallogenesis. [ii]. H. Hensoldt 375 
Editorial Comments— The Philadelphia meeting of the International 
Congress of Geologists, 379 
Correspondence— Tostscript to the article on the Maquoketa shales, 
Jos, F. James, 394. 
Review of recent Geological literature. — The Trenton limestone as a 
source of petroleum and inflammable gas, Edward Orton, 388 
List of Recent publications, 391 
Personal and scientific news 394 
Index to volume v 395 
