TABLE OF CONTENTS ix 



The Problems of Astrophysics ......... 446 



WILLIAM WALLACE CAMPBELL 



Short Papers 470 



Bibliography : Department of Astronomy 471 



DEPARTMENT XII SCIENCES OF THE EARTH 



The Methods of the Earth-Sciences 477 



THOMAS CHROWDER CHAMBERLIN 



The Relations of the Earth-Sciences in View of their Progress in the Nine- 

 teenth Century 488 



WILLIAM MORRIS DAVIS 



SECTION A GEOPHYSICS. 



Present Problems of Geophysics 508 



GEORGE FERDINAND BECKER 



SECTION B GEOLOGY. 



The Problems of Geology 525 



CHARLES RICHARD VAN HISE 



SECTION C PALEONTOLOGY. 



The Relations of Paleontology to Other Branches of Science . . .551 



ARTHUR SMITH WOODWARD 



The Present Problems of Paleontology 566 



HENRY FAIRFIELD OSBORN 



SECTION D PETROLOGY AND MINERALOGY. 



The Relations existing between Petrography and its Related Sciences . 591 



FERDINAND ZIRKEL 



Short Paper 604 



SECTION E PHYSIOGRAPHY. 



The Relations of Physiography to the Other Sciences .... 607 



ALBRECHT PENCK 



Works of Reference to accompany Professor Penck's Paper .... 626 



Physiographic Problems of To-day ... .... 627 



ISRAEL COOK RUSSELL 



SECTION F GEOGRAPHY. 



The Present Problems of Geography ........ 653 



HUGH ROBERT MILL 



The Relative Value of Geographical Position ...... 671 



HENRY YULE OLDHAM 



