SCIENeE 



A WEEKLY NEWSPAPER OF ALL THE ARTS AND SCIENCES. 



PUBLISHED BY N, D. C. HODGES, 874 BROADWAY, NEW YORK. 



Tenth Yeab. 

 YoL. XIX. No. 4 



JUNE 10, 1892. 



Single Copies, Ten Cents. 

 3.50 Per Year, in Advance. 



Contents. 



DrREOT Reflecting Polariscopes. T. 



Proctor Hall 333 



Notes on the Fertility of Phtsa 

 Hetekostbopha Say. W. L. Pot- 

 eat 323 



Nebraska Sugar School 324 



Secondary Batteries 324 



Notes and News 



THE 



]ell Te 



326 



A Brief Study of the Palenque Tablet. 



Cyrus Thomas 328 



The New Element, Masrium. A. E. 



Tutfon 329 



Some Notes on the Victoria Nyanza. . 330 

 Letters to the Editor. 



The Relative Hardness of Cut Dia- 

 monds. Wm. A. Rogers 331 



The Notion of Four-Fold Space. C. 



Staniland Wake 331 



The Possibility of a Realization of 

 Four-Fold Space. Edmund C. 



Sanford 332 



Eskimo Throwing-Sticks. 0. T. 



Mason 832 



Among the Publishers 332 



Entered at the Post-Offloe of New York, N.Y., as 

 Second-Class Mail Matter. 



COMPANY. 

 98 MILK ST„ BOSTON, MASS. 



Thi.s Company owns the Letters 

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The Transmission of Speech hy 

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iVew Method of Protecting Property 

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The LigMning Dispeller. 



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No recorded case of lightning stroke has 

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Correspondence solicited. 



AGENTS WANTED. 



The American Lightning Protection Company 



United Bank Building, Sioux City, Iowa. 



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