iv CONTENTS OF VOLOME TV: 
REMARKS ON PETALODUS ALLEGHANIENSIS. Charles R. Eastman - - 
ON THE NATURE OF IGNEOUS INTRUSIONS. Israel C. Russell - - - 
STUDIES FOR STUDENTS: Deformation of Rocks. C.R. Van Hise - - 
EDITORIALS - - - - - - - - - - - - 
REVIEWS: Age of the Second Terrace on the Ohio at Brilliant near Steuben- 
ville, by G. Frederick Wright (review by T. C. Chamberlin), 218. 
North American Fossil Crinoidea Camerata, by Charles Wachsmuth 
and Frank Springer (review by Charles R. Keyes), 221. En resa till 
norra ishafvet sommaren 1892 foretagen med understod af vegastipen- 
diet (A Journey to the Arctic Ocean during the Summer of 1892, made 
with the Aid of the Vega Stipend), by Axel Hamberg (review by J. A. 
Udden), 240; Paleontographia Italica. Memoire di Palzontologia, 
by Mario Canavari (review by J. P. S.), 242; The Soil: Its Nature, 
Relations and Fundamental Principles of Management, by F. H. 
King (review by J. C. B.}, 243. 
AUTHORS’ ABSTRACTS: The Loess of Western Illinois and Southeastern 
Iowa, by Frank Leverett, 244; Possible Depth of Mining and Boring, 
by Alfred C. Lane, 244; The Soils of Texas, by E. T. Dumble, 245; 
The Yardley Fault and The Chalfont Rock, so-called, by Benjamin 
Smith Lyman, 245; Crystalline Limestones of the Northwestern 
Adirondack Region, by C. H. Smyth, jr., 246; U.S. Geologic Atlas, 
Folio 1, Livingston, Montana, 246; U.S. Geologic Atlas, Folio 3, 
Placerville, California, 248; U.S. Geologic Atlas, Folio 5, Sacra- 
mento, California, 250; U. S. Geologic Atlas, Folio 7, Pikes Peak, 
Colorado, 251; U.S. Geologic Atlas, Folio 9, Anthracite — Crested 
Butte, Colorado, 253. 
NUMBER III. 
THE MAGMATIC ALTERATION OF HORNBLENDE AND BIOTITE. Henry S. 
Washington - - - - - - - - - - 
ON THE ORIGIN OF THE CHOUTEAU FAUNA. Henry Shaler Williams — - 
NorRTH AMERICAN GRAPTOLITES. R. R. Gurley - - - - - 
STUDIES FOR STUDENTS: Deformation of Rocks. II. C.R.Van Hise - 
EDITORIAL - - - - - - - - - - - - 
REVIEWS: Geological Biology, an Introduction to the Geological History 
of Organisms, by H. S. Williams (review by S. Weller), 355; Cana- 
dian Fossil Insects, by S. H. Scudder (review by S. Weller), 360. 
Summary of Current Pre-Cambrian North American Literature, by 
C. R. Van Hise, 362. 
AuTHoRS’ ABSTRACTS: Origin of the Iowa Lead and Zinc Deposits, by A. 
G. Leonard, 373; The Gold-Silver Veins of Ophir, California, by W. 
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