SCIENCE. 



A Weekly Journal devoted to the Advancement 



of Science. 



Editorial Committee : S. Newcomb, Mathematics ; R. S. Woodward, Mechanics; 

 E. C. Pickering, Astronomy ; T. C. Mendenhall, Physics; R. H. Thurston, 

 Engineering; Ira Remsen, Chemistry; Joseph Le Conte, Geology; W. M. 

 Davis, Physiography; O. C. Marsh, Paleontology; W. K. Brooks, Inverte- 

 brate Zoology; S. H. Scudder, Entomology; C. Hart Merriam, Vertebrate 

 Zoology; N. L. Britton, Botany; Henry F. Osborn, General Biology; H. 

 P. Bowditch, Physiology; J. S. Billincs, Hygiene; J. McKeen Cattell, 

 Psychology ; Daniel G. Brinton, J. W. Powell, Anthropology. 



SCIENCE holds the position in America that is held 

 by Nature in England. It reports on the progress of 

 science with special reference to the most recent work 

 of American men of science. Science is making rapid 

 progress in America in all directions, and in some of its 

 departments is in advance of any other country. A know- 

 ledge of the work being accomplished is essential to all 

 who wish to follow the progress of science, and this can 

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