VI CONTENTS. 



General Appendix. 



Page. 



The daily influence of astronomy, by W. W. Campbell 139 



Cosmogony and stellar evolution, by J. H. Jeans 153 



The diameters of the stars, by A. Danjon 165 



Atomic weights and isotopes, by F. W. Aston 1S1 



Modifying our ideas of nature: The Einstein theory of relativity, by 



Henry Norris Russell 197 



The alkali problem in irrigation, by Carl S. Scofield 213 



An outline of geophysical-chemical problems, by Robert B. Sosman 225 



The yielding of the earth's crust, by William Bowie 235 



The age of the earth, by the Right Hon. Lord Rayleigh, W. J. Sollas, 



J. W. Gregory, and Harold Jeffreys 24!) 



The department of geology of the United States National Museum, by 



George P. Merrill 261 



Some observations on the natural history of Costa Rica, by Robert Ridg- 



way 303 



The historic development of the evolutionary idea, by Branislav Pet- 



ronievics 325 



The heredity of acquired characters, by L. Cuenot 335 



Breeding habits, development, and birth of the opossum, by Carl Hartman_ 347 

 Some preliminary remarks on the velocity of migratory flight among 



birds, with special reference to the Palaearctic region, by R. Meinertz- 



hagen ; 365 



A botanical reconnaissance in southeastern Asia, by A. S. Hitchcock 373 



Ant acacias and acacia ants of Mexico and Central America, by W. E. 



Safford 331 



The fall webworm, by R. E. Snodgrass _ 395 



Collecting insects on Mount Rainier, by A. L. Melander 415 



The science of man : Its needs and its prospects, by Karl Pearson 423 



Pigmentation in the old Americans, with notes on graying and loss of 



hair, by Ale§ Hrdlic'ka 443 



Ancestor worship of the Hopi Indians, by J. Walter Fewkes 485 



The Indian in literature, by Herman F. C. Ten Kate 507 



Leopard-men in the Naga Hills, by J. H. Hutton 529 



A new era in Palestine exploration, by Elihu Grant 541 



The alimentary education of children, by Marcel Labbe 549 



A 50-year sketch-history of medical entomology. L. O. Howard 565 



Laid and wove, by Dard Hunter 587 



Lead, by Carl W. Mitman 595 



William Crawford Gorgas, by Robert E. Noble 615 



