SCIENCE. 



[Vol. XV. No. 383 



C ALICRAPH 



GREATEST SPEED! 



BEST FOR MANIFOLDING. 



100,000 Dally users. 



" I advise all parents to have their boys and girls taught shorthand-writing and type-writing. A ste- 

 nographer who can type-write his notes would be safer from poverty than a great Greek scholar " 



Charles Reade, on "The Coming Man."' 



Remington 



Standard Typewriter. 



For Fifteen Years the Standard, and 

 to-day the most perfect development of 

 the writing-machine, embodying the latest 

 and highest achievements of inventive and 

 mechanical skill. We add to the Reming- 

 ton every improvement that study and cap- 

 ital can secure. 



WYCKOFF, SEAMANS & BENEDICT, 



New York 



THE MOST DURABLE. 



Single Case, No. 1, • • $70.00 



Doable Case, " S, ■ - • 85.00 



New Special, "3, - - - 100.00 



For account of speed contests and 



Circalars, address 



THE AMERICAN WRITING MACHINE CO., 



HARTFORD, CONN. 



BRANCH OFFtCES: 237 BROADWAY, NEW YORK. 



14 West 4th Street, Cincinnati, O. 



1003 ARCH Street, Philadelphia. 



English Factory, Coventry, England. 



G. 



"LooMis SYSTEM." INCANDESCENT 



ELECTRIC LMTM 



LOW TENSION. PERFECTLY SAFE. 

 DYNAMOS 



ABSOL UTEL Y A UTOMA TIC. 



liAMPS, SOCKETS, AND SAFETY APPLIANCES 



EXCEL, ALL OTHEK, SYSTEMS FOR 



EFFICIENCY AND DURABILITY. 



Send for Catalogue. 



EUREKA ELECTRIC CO. 



18 Broadway, Biew York 



The Loomis Dynamo. 



The preservation of one's business appointments is as essential to a 



THE HULIN 



DIARY CALENDAR. 



business man as are checl<s, vouchers, &c. 



K. ANDERb 



30 Hanover St., Boston, Mass. 



is calendar is a great improvement upon any- 



■'"^S? '^ °^ ^^^ kind that has ever been published. We 



p re three times the space for memorandums of 



.-r*^ 



Circulars free. 



Mention this paper. 



IMPROVED OIL LIGHT 



MAGIC LANTERNS. 



Also Lime and Electric Light Apparatus, and 



mechanical, plain, and fine colored views. 



J. B. COLT & CO., Manufacturers, 



No. 16 Beekman Street, New York. 



PHYSICAL, ELECTRICAL 

 AND CHEMICAL 



APPARATUS 



Of High Grade. 



FOR SCHOOLS AND COLLEOES. 



Send for List of Catalogues. 



8UEEN & CO, Philadelphia. 



any other, and the leaves are preserved for future 

 reference . 



Send for full descriptive circular of this useful 

 article, as well as our other Office Specialties and 

 Labor-Saving devices for accountants. 



Balance of our stock for 1890, REDUCED to 



25c. Each 



Complete tvlth Wive Stand, 

 FORMER PRICE 50c. EACH. 





JOHN S. HULIN, Manufacturing Stationer and Steam Printer. 



Headquarters for Fountain and Stylographic Pens, Letter Files, Type Writers' Materials, Edison's Mimeo- 

 graph, and all Stationery Supplies, as well as Wedding Invitations and Visiting Cards- Send 

 stamp for our Illustrated Catalogue of useful Office Specialties and Labor-Saving 

 Devices for Accountants. 



J. S. HFLiIlV, 369 Broadway, New York. 



HEAD-TIRbU k'tOPLE 



Too busy to bother ■with Athletio 

 machines, should look into the new 

 Checklcy System as fully described in 

 Edwin Ohecklev's remarkable "Natur- 

 alMetbod of Physical Training/'just 

 published "A Pioneer in Prac- 

 tical B'veriene," is what Dr. 

 Buchanan, calia Prof Checkley. The 

 new system fits into the every-day 



ROSE POLYTECHNIC INSTITUTE, 



* * TERRE HAUTE, IND -A SCHOOL OF ENGINEERING. 

 Well endowed, well equipped departments of Me- 

 chanical and Civil En^neering, Electricity, Chemis- 

 try, Drawing. Extensive Shops & Laboratories. Ex- 

 penses low. For catalogue address C.A.Waldo, Lib^'n. 



MINERALS 



Cabinet Specimens and Collections. 



When in New York do not faU to visit our New 

 York store. On account of our very large stock we 

 are able to keep there as well as in Philadelphia a 

 very fine selection of choice Mineral Specimens. 

 Send for Complete Catalogue, Free. 

 GEO. L. EIV'GLISH tfc CO.. Dealers in Minerals, 

 1512 Chestnut St., Philadelphia. 

 T39 & 741 Broadway, New York. 



Readers of Science 



Corresponding or visiting with Adver- 

 tisers, will confer a great favor by mention- 

 ing this paper. 



