6 CONTENTS. 



EXECUTIVE COMMITTEE AND BEGENTS. 



Page. 



Report of Executive Committee 123 



Proceedings of Board of Regents 127 



GENERAL APPENDIX. 



Studying the sun's heat on mountain peaks in desert lands, by C. G. 



Abbot 145 



The habitability of Venus, Mars, and other worlds, by C. G. Abbot 165 



Giant suns, by H. H. Turner 173 



A bundle of meteorological paradoxes, by W. J. Humphreys 183 



The determination of the structure of crystals, by Ralph W. G. WyckofJL 199 

 Dr. Aston's experiments on the mass spectra of the chemical elements, 



with introduction by C. G. Abbot 223 



Vitamins, by W. D. Halliburton 241 



Soil acidity — its nature, measurement, and relation to plant distribution, 



by Edgar T. Wherry 247 



The chemistry of the earth's crust, by Henry S. Washington 269 



Major causes of land and sea oscillations, by E. O. Ulrich 321 



The Bryozoa, or moss animals, by R. S. Bassler 339 



The horned dinosaurs, by Charles W. Gilmore 381 



Rhythm in nature, by F. W. Flattely 389 



Parasitism and symbiosis in their relation to the problem of evolution, 



by Maurice Caullery 399 



Local suppression of agricultural pests by birds, by W. L. McAtee 411 



The occult senses in birds, by Herbert H. Beck 439 



Adventures in the life of a fiddler crab, by O. W. Hyman 443 



The senses of insects, by N. E. Mclndoo 461 



The resplendent shield-bearer and the ribbed-cocoon-maker: Two insect 



inhabitants of the orchard, by R. E. Snodgrass 485 



The origin of insect societies, by Auguste Lameere 511 



The botanical gardens of Jamaica, by William R. Maxon 523 



Narcotic daturas of the Old and New World ; an account of their remark- 

 able properties and their uses as intoxicants and in divination, by 



William E. Safford 537 



Effect of the relative length of day and night on flowering and fruiting 



of plants, by W. W. Garner and H. A. Allard 569 



Fire worship of the Hopi Indians, by J. Walter Fewkes 589 



Racial groups and figures in the Natural History Building of the United 



States National Museum, by Walter Hough 611 



Notes on the dances, music, and songs of the ancient and modern Mexi- 

 cans, by Auguste Genin 657 



The Ralph Cross Johnson collection in the National Gallery at Wash- 

 ington, D. C, by George B. Rose 679 



