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A WEEKLY NEWSPAPER OF ALL THE ^!!'>^="o;,..^,;;^ SCIENCES. 



PUBLISHED BY N. D. C. HODGES, 874 BROADWAY, NEW YORK. ""'•'7 



Tenth Yeae. 

 Vol. XX. No. 507. 



OCTOBER 31, 1892. 



Single Copies, Ten Cents. 

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Contents. 



The Cadses op Infectious Diseases. Hugo 



Engel 235 



How TO Mount Birds Without Removing the 



Skeleton. Ulysses 0. Cox 287 



The Communal Barracks of Primitive Races. 



S.E.Peal 228 



The Utility of Vegetable Acids in Food. H. 



J.Patterson 229 



Brain and Skull Correlations. S. V. Cleven- 



ger 230 



Indications of a Rainy Period in Southern 



Peru. A.E.Douglass 231 



Current Notes on Anthropology. — XVII. 



Daniel G. Brinton, Editor 2.32 



Scents and their Recognition. J. W. Slater. 233 

 The PERCOPSiDiE on the Pacific Slope. Carl 



H. Eigenmann 233 



Michigan Mining School 234 



Letters to the Editor. 



On the Interpretation of the Markings on 



Mars. Hiram M Stanley 235 



The Lines on Mars. William J. Hussey 235 



A New Habitat of the Blaclj-Throated Rock 



Swift, M-icropus Melanoleucus. Erwin H. 



Barbour 235 



Star 1830 Groombridge. Henry H. Bates .... 236 

 Dr. Brendel's Photographs of Auroras. 



James P. Hall 236 



Book Reviews. 



The Horse; A Study in Natural History 237 



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