SCIENCE. 



[Vol. XIV. No. 342 



Sprague !Electric Railivay and Motor Company. 



Lightest Weight Consistent with 

 Highest Efficiency, 



SliVIPLE IN CONSTRUCTION. 

 Not Liable to get out of Order. 



Bearings Self Oiling. 

 NON-SPARKING IN OPERATION. 



Commutator Wear Reduced 

 to a Minimum. 



16 and 18 BROAD STREET, NEW YORK. 



The Mutual Life Insurance Company 



OF NEW YORK. 

 RICHARD A. McCURDY, PRESIDENT. 



$126,082,15356 



ASSETS 



The Largest and best Life Insurance Company in the World. 



The New Business of the Mutual Life Insurance Company in 18 



Exceeded $103,000,000. 



Its Business shows the Greatest Comparative Gain made by 

 any Company during the past year including 



A gain in assets of 8 7,275,301 68 



A gain in income of 3,096,010 06 



A gain in new premiums of 2,333,406 00 



A gain in surplus of 1,645,622 11 



A gain in new business of . 33>7S6,792 85 



A gain of risks in force 54,496,25 1 85 



Thii^Ml Lift Insurance Company 



Has Paid io''''^"''iuyj"^ -V^,^^^' -'•s since Organization $272,481,839 82 



^s> 



J'»,. 



Electrica l 

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Furnishings. 



32 & 34 Frankfort St., 

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0/d and Rare Books. 



One Million Magazines. Back numbers, vols. 



and sets — old and new, Foreign and American. 



CATALOGUE UPON APPLICATION. 



A. S. CLARK, 



34 Park Row, New York City. 



JACK NUMBERS and complete sets of leading Mag- 

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JOHNS HOPKINS UNIVERSITY, 



BALTIMORE. 



Announcements for the next academic 

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FOOD 

 ADULTERATION 



And its Detection. With photomicrographic plates an 

 a bibliographical appendix. Bj' J P. Battershall. 35 

 pages. 8vo, cloth. Price, 83.50. Circulars and Catalogut 

 on application. E. & F. N. SPON, 



12 Conlandt St., New York. 



THE 



]ell \h 



COMPANY. 



96 MILK ST., BOSTON, MASS. 



Tlii.s Coiiipauy owns the Letters 

 Patent granted to Alexander Glra- 

 ham Bell, March 7th, 1876, No. 

 174,465, and January 30, 1877, 

 No. 186,7§7. 



The Transmission of Speech bj' 

 all known forms of ELECTKIC 

 SPEAKING TELEPHONES in- 

 fringes the right secured to this 

 Company by the above patents, and 

 renders each individual usex" of tel- 

 ephones, not furnished by it or its 

 licensees, responsible for such un- 

 lawfitl use, and all the conse- 

 quences thereof and liable to suit 

 therefor. 



ESTERBROOK'S 

 STEEL PENS. 



OF SUPERIOR AND STANDARD QUAL[TY. 

 Leading Nos.: 048, 14, 130, 135. 239, 333 



JFor Srile by all Stationers. 



THE ESTERBROOK STEEL PEN CO., 



Works : Oamden. N. J. ti6 Jotiu St., New York. 



Til 



fTA IN THE WORLD. Ci 



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d by thousands of first-class 



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PuUman Palace Cct Co., 



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CIOUCESTER, MASS. 

 Send 10c. aud dealers' card who 

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