^A 



NCR 



Eleventh Year. 

 Vol. XXI. No. 520. 



JANUARY 20, 1893. 



■'Qf- 



Single Copies, ■ '. •• 



Cents. 

 $3.50 Per Year, in Advance. 



Contents. 



Gravel Man and PAL.a:oLiTHic Culture; A Pre- 

 liminary Word. W. H. Holmes 



The Nest of the Trap-Door Spider. D. Cleve- 

 land 



Balances of the Peruvians and Mexicans. 



Walter Hough 



An Interesting Sensory Organ in Certain 



Plant-Lice. John B. Smith 



The Indiana Academy op Science 



Life-Saving. Delos Fall 



Notes AND News 



The American Psychological Association 



Association of American Anatomists 



Notes on the Occurrence op Rubellite and 

 Lepidolite in Southern California. 



Harold W, Fairbanks — 



Letters to the Editor. 



Snake Story. Mrs. W. A. Kellervian 



Geographical Variation in Birds. Hubert 



Lyman Clark . . 



Pseudoaurora Not Shadows. P. L. Hatch.. 

 Natural Selection at Fault. J. W. Slater. . . 

 Speed of Flight of Birds. Hubert Lyman 



Clark 



Bowser's Trigonometry. H. L. Hodgkins.. 



Huinmine;-Bird''s Pood. Alvah A. Eaton 



A Peculiar Fire. G. D. Shepardson 



Electrical Phenomena on Mountains. Geo. 



Cluloiv 



Maya Codices. Cyrus Thomas 



Book Reviews 



Among the Publishers 



NEW SCIENTI_FIC BOOKS. 



Extinct Monsters. 



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New Edition of HaeckeVs " Creation.'''' 



The History of Creation; 



Or, The Development of the Earth and its Inhabi- 

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Charles Darwin : 



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The Interpretation of Nature. 



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MACMILLAN & CO.'S NEW BOOKS. 



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ELECTRICAL PAPERS. 



By Oliver Heaviside. Two volumes, 8vo, §10.C0. 



THE VISIBLE UNIVERSE. 



Chapters on the Origin and Construction of the Heavens. By J. Ellakd Gore. With Stellar Photographs and other Illustrations- 



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ELECTRIC LIGHTING AND POWER DISTRIBUTION. 



An Elementary Manual for Students preparing for the ordinary grade examination of the City and Guilds of London Institute. By W. 

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PRACTICAL ELECTRIC-LIGHT FITTING. 



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COAL PITS AND PITMEN. 



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