CONTENTS Page 



Originai, Papers 



Inorganic Chemistry. — The crystal structure of the alkali halides. I. Ralph W. 



G. Wyckoff 429 



Ornithology. — Three new birds of the family Tinamidae from South America. Alex- 



ANDER Wetmore 434 



Agricultural Chemistry. — The effect of alum on silicate colloids. C. S. ScofiELd 438 



Abstracts 



Physics 439 



Metallography 440 



Geodesy 440 



Inorganic Chemistry 441 



Mineralogy .' 441 



Geology and Hydrology. 441 



Proceedings 



Washington Academy of Sciences " 443 



Geological Society 444 



Scientific Notes and News '■ « 447 



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Fewkes, J. Walter. A theatrical performance at Walpi. 26 pp., 3 pis $0.15 



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Davis, Henry E. The political development of the, District of Columbia. 



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