CONTENTS. 
. JANUARY NUMBER. 
Page. 
BIOGRAPHICAL NOTICE OF WILLIAM HENRY PETTEE. 
Israel C. Russell. [Portrait, Plate I.] 1 
PRESENT PROBLEMS OF GEOPHYSICS. George F. Becker, 4 
NOTES ON THE APICAL END OF THE SIPHUNCLE IN 
SOME CANADIAN ENDOCERATIDAE, WITH DESCRIP- 
TIONS OF TWO SUPPOSED NEW SPECIES OF NAI^NO. 
J. F. Whiteaves. [Plates II and III.] 23 
THE PROGRESS OF VERTEBRATE PALEONTOLOGY AT 
THE AMERICAN MUSEUM OF NATURAL HISTORY, 
NIi:W YORK. O. P. Hay al 
THE COMPARATIVE ACCURACY OF THE METHODS FOR 
DETERMINING THE PERCENTAGES OF THE SEVERAL 
COMPO.NENTS OF A.\ IGNEOUS ROCK. Ira A. Williams 34 
THE ORIGIN OF BITUMEN. W. C. Morgan 46 
DEVELOPMENT AND MORPHOLOGY OF FENESTELLA. 
E. R. earnings 50 
PLEISTOCENE HISTORY OF FISHER'S ISLAND, N. Y. M. L. 
Fuller ; 51 
SOME DRAINAGE FEATURES OF SOUTHERN CENTRAL 
NEW YORK. R. S. Tarr 52 
MOUNTAIN GROWTH AND MOUNTAIN STRUCTURE. 
Bailey Willis 52 
REVIEW OF RECENT GEOLOGICAL LITERATURE. Indiana 
Department of Geology and Natural Resources. Twenty- 
eighth Report. W. S. Blatchley, 53; The Geology of the 
San Jose District, Tamaulipas, Mexico. George I. Finlay, 
55; The Geology of the Cerrillos Hills, New Mexico. D. W. 
Johnson, 5G 56 
MONTHLY AUTHOR'S CATALOGUE OF RECENT GEOLO- 
LOGICAL LITERATURE 59 
PERSONAL AND SCIENTIFIC NEWS 62 
FEBRUARY NUMBER. 
THE COARSENESS OF IGNEOUS ROCKS AND ITS MEAN-* 
ING. [Plate IV.] A. C. Lane 65 
GERARD TROOST. [Portrait.] L. C. Glenn 72 
NOTES ON SOME ROCKS AND MINERALS FROM NORTH 
GREENLAND AND FROBISHER BAY. [Plate VI.] B. K. 
Emerson 94 
MONTANA GYPSUM DEPOSITS. [Plates VII-X.] J. P. Rowe 104' 
