SCIENCE 



A WEEKLY JOURNAL 



DEVOTED TO THE ADVANCEMENT OF SCIENCE. 



Editorial Committee : S. Newcomb, Mathematics ; E. S. TVoodwaed, Mechanics ; E. C. Pickering, As- 

 tronomy ; T. C. Mendenhall, Physics ; E. H. Thurston, Engineering ; Ira Eemsen, Chemistry ; 

 J. Le Conte, Geology; W. M. Davis, Physiography; O. C. Marsh, Paleontology; W. K. Brooks, 

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

 N. L. Britton, Botany ; Henry F. Osboen, General Biology ; H. P. Bowditch, 

 Physiology ; J. S. Billings, Hygiene ; J. McKeen Cattell, Psychology ; 

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



l^EW SERIES. VOLUME II. 

 JULY TO DECEMBER, 1895. 



NEW YORK 



41 East Foety-ninth Steeet 



1895 



