VI CONTENTS 



General Appendix 



Page 



The wider aspects of cosmogony, by J. H. Jeans 165 



The stars in action, by Alfred H. Joy 179 



Island galaxies, by A. Vibert Douglas 198 



Astronomical telescopes, by F. G. Pease 201 



New results on cosmic rays, by R. A. Millikan and G. H. Cameron 213 



Three centuries of natural philosophy, by W. F. G. Swann 233 



The hypothesis of continental displacement, by Charles Schuchert 249 



On continental fragmentation and the geologic bearing of the moon's 



surficial features, by Joseph Barrell 283 



The "craters of the moon" in Idaho, by Harold T. Stearns 307 



The oldest known petrified forest, by Winifred Goldring 315 



Water divining, by J. W. Gregory 325 



Some problems of polar geography, by R. N. Rudmose Brown 349 



Birds of the past in North America, by Alexander Wetmore 377 



Mammalogy and the Smithsonian Institution, by Gerrit S. Miller, jr 391 



The controversy over human "missing links," by Gerrit S. Miller, jr 413 



What is known of the migrations of some of the whalebone whales, by 



Remington Kellogg 467 



Ecology of the red squirrel, by A. Brooker Klugh 495 



Some adventures of a naturalist in the Ceylon jungle, by Casej' A. Wood- 525 



Communication among insects, by N. E. Mclndoo 541 



Our insect instrumentalists and their musical technique, by H. A. Allard__ 563 



The Neanderthal phase of man, by Ales Hrdlicka 593 



American Indian costumes in the United States National Museum, by 



H. W. Krieger 623 



Mounds and other ancient earthworks of the United States, by David I. 



Bushnell, jr 663 



Geochronology, as based on solar radiation, and its relation to archeology, 



by Gerard de Geer 687 



The physiology of the ductless glands, by N. B. Taylor 697 



Svante Arrhenius, by Sir James Walker 715 



Theodore William Richards, by Gregory P. Baxter 737 



