VI CONTENTS 



General Appendix 



Page 



The spiral nebulae and the structure of space, by Carl Wirtz 137 



Immensities of time and space, by A. Vibert Douglas 147 



Certain aspects of high-pressure research, by P. W. Bridgman 157 



Lightning and other high-voltage phenomena, by F. W. Peek, jr 169 



Chemical elements and atoms, by G. Urbain 199 



The manufacture of radium, by Camille Matiguon 221 



The chemistry of solids, by Cecil H. Desch 235 



Terrestrial magnetism in the twentieth century, by Daniel L. Hazard 243 



Some causes of volcanic activity, by Arthur L. Day 257 



Geology in the service of man, by W. W. Watts 271 



The yeasts : a chapter in microscopical science, by A. Chaston Chapman _ 297 

 Tropical cyclones and the dispersal of life from island to island in the 



Pacific, by Stephen Sargent Visher 313 



Isolation with segregation as a factor in organic evolution, by David 



Starr Jordan 321 



The biological action of light, by Leonard Hill 327 



Animal life at high altitudes, by Maj. R. W. G. Kingston 337 



The nest of the Indian tailor bird, by Casey A. Wood 349 



The needs of the world as to entomology, by L. O. Howard 355 



From an egg to an insect, by R. E. Snodgrass 373 



The role of vertebrates in the control of insect pests, by W. L. McAtee__ 415 



Carnivorous butterflies, by Austin H. Clark 439 



The potato of romance and reality, by W. E. Safford 509 



The relation of geography to timber supply, by W. B. Greeley i_ 533 



The historical geography of early Japan, by Carl Whiting Bishop 547 



The excavations of the sanctuary of Tanit at Carthage, by Byron Khun 



de Prorok 5G9 



The Smithsonian Institution, by C. G. Abbot 575 



Sir Archibald Geikie, by Sir Aubrey Strahan 591 



Ned Hollister (1876-1924), by Wilfred H. Osgood 599 



