SCIENCE. 



[Vol. XIII. No. 334 



Spragne Electric Railway and Motor Company. 



Bearings Self Oiling, 

 NON-SPARKING IN OPERATION, 



Lightest Weight Consistent with 

 Highest Efficiency. 



SIMPLE IN CONSTRUCTION. 

 Not Liable to get out of Order- 



Commutator Wear Reduced 

 to a Minimum. 



16 and 18 BROAD STREET, NEW YORK. 



IV tO other Life Policies as liberal cost as little! 

 ^ ^ money, no others as cheap give as much for the' 

 money, as those of 



THE TRAVELERS 



OF HARTFORD, CONN. 



Best either for Family Protection or Investment of 

 Savings. Non-forfeitable, world-wide, lowest cash rate. 

 All claims paid without discount, and immediately 

 on receipt of satisfactory proofs. 



S-ULZ?X>1'CLS , 



JAS. G. BATTERSON, President. 



S10,3S3,000. 



,04:1.000. 



RODNEY DENNIS, Secretary. 



KIMBALL'S 



STRAIGHT CUT 



CIGARETTES 



Unsurpassed in quality. 



Used by people of refined taste. 

 Highest award at Brussels, 1888. 

 The finest smoking mixtures are of 



inufacture. 

 Fifieen First Prize Medals. 

 WM. S. KIMBALL & CO.. 



Rochester. N.Y. 



PICK 



IMPROVING 



THE 



MEMORY 



and facilitating the acquirement of knowledge by 

 lectures and correspondence. Classes forming. 

 "MEMORY and its Doctors," from aimonides to 

 "Loisette," mailed for 25 cents (New Edition). 



DR. PICK, 24 Union Square, N. Y. City. 



FOOD 

 ADULTERATION 



And its Detection. With photomicrographic plates and 

 a bibliographical appendix. By J. P. Battershall. 328 

 pages, 3vo, cloth. Price, $3-50. Circulars and Catalogues 

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



12 Cortlandt St., New York. 



ESTERBROOK'S 

 STEEL PENS. 



OF SUPERIOR AND STANDARD QUALITY. 

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



For Sale by all Stationers. 



THE ESTERBROOK STEEL PEN CO., 



Works : Oamdeu, N. 



^^ ^ 'W'° '?*«&^"' ^ ***■' 





frtj 



Glue is manufactured solely by tin 



RUSSIA CEMENT CO, 



GLOUCESTER, MASS. 

 Send lOf. and dealers^ card who 



doesn't keep ' ' 



;tock, f 01 



