March 29, 1889.] 



SCIENCE. 



C. & C. ELECTRIC MOTOR COMPANY. 



Electric Motors 



FOR 



Arc and Incandescent Cir- 

 cuits, Most Economi- 

 cal Motor on the 

 Market. 

 Regulation Perfect. 

 Motors Designed for all 

 Power Purposes. 



^^rl^. 



OFFICE and MANUFACTORY: 



402 and 404 Greenwich Street, New 

 York Citv. 



New England Office, 19 Pearl St,, Boston. 



Philadelphia Office, 301 Arch St. 



Western Office, 139-141 Adams Street 

 Chicago. 



Southern Office, 25 Carondelet Street, 

 New Orleans. 



Schools. 



New Jersey. P 

 'T-HE CHESTNUIS 



Mi: 



^E. E. Ke 



th daughters to edu 

 th companion, may find 

 th school instruction by applying t 



New York City, N. Y. 



BOTANY, MICROSCOPY-PRACTICAL courses 

 at the New York College of Pharmacy open for 

 ladies and gentlemen from April lo to end of June, in- 

 cluding botanical excursions and individual instruction 

 in microscopic work. For particulars apply to College, 

 209-213 East sad St., or to PROF. J. SCHRENK, 

 Hoboken, N. Y. 



Connecticut, New Haven, 



MRS. CADY'S SCHOOL FOR YOUNG LADIES, 

 Prepares for Smith and Wellesley, and admits tc 

 Vassar by Certificate. Circulars. Early applicatior 

 necessary. 



VER^.ONT, Burlington. 



VERMONT EPISCOPAL INSTITUTE. Boarding 

 School for Boys. Prepares for College or Business. 

 Military drill. Terms moderate. Fifty-seventh half- 

 year opens September 3, 188S. Send for catalgue. 



H. H. ROSS, A.M., Principal. 



Terre Haute, Ind. 

 ■DOSE POLYTECHNIC INSTITUTE.-A School 

 ^^ of Engineering. Well endowed, well equipped depart- 

 ments of Mechanical and Civil Engineering. Electricity. 

 Chemistry, Drawing. E,\tensive Shops & Laboratories. 

 E.vpenses low. For catalogue address T. C. Mendenhall, 

 Pres. 



Brokers and Ajiciioneers. 



R. ELLIS & CO. 



BUSINESS, HOTEL AND PATENT BROKERS, 

 AUCTIONEERS, ETC. 



JTo. 176 BUft^nif^^l:', 



Room 46. 



JTew York, 



A dziiscd free 0/ charge. 



J. p. TRAVER & CO., 



General Auctioneers, 



Real Estate and Business Brokers, 



OFFICE, 23 PARK ROW, 



Opposite Posr Office, (.Rooms 14& 15.1 New York. 



Mortgages Foreclosed. Cash Advanced on Consignments. 



Property of Every Description Bought, Sold 

 and Exchanged. 



Scientific Apparatus. 



J. GRUNOW 



631 Sixth Avenue, N 



Established 1832 



MAKER OF 



Microscope Stands, 

 Oil Immersion Object- 

 ives and Abbe Con- 

 densers for Bacterial 

 and Histological work, 

 of Objectives, Camera 

 Lucida and other ac- 

 cessory apparatus, 



IMPROVED^OIL LIGHT 



MAGIC LANTERNS. 



Also Lime and Electiic Light Apparatus, and 



mechanical, plain, and fine colored views. 



J. B. COLT & CO., Manufacturers, 



No. 16 BtEKMAN Street, New York. 



MAGIC Stereopticons and the Best Views 



, ..,^_„„„ for Public, Church, Home, and 

 LANTERNS Scientific E.\hibitions. Best appa- 

 ratus, new views. Largest stock. Reduced prices. 24 

 Years' Practical Experience. Illus. Catalogue Free. 



GEO. H. PIERCE, 

 136 S. Eleventh St., Philadelphia, Pa 



ELECTRICAL TESTING BUREAU, 



Johns Hopkins University, Baltimore, Md. 



Resistance Coils and Boxes Compared. 



Am meters and Volt meters calibrated. 



Condensers standardized. 



Primary and Secondary Batteries Tested. 



Efficiency of Dynamos and Motors Deter- 

 mined. 



Insulation of Cables and Wires Tested. 



Etc., Etc. 



Circulars describing Methods Used, Prices, 

 Etc., sent on Application. 



Address as above. 



EARLE & CO. 



SUCCESSORS TO 



K. & J. BECK, 



1016 Chestnut Street Phiia 



Microscopes and all 

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 paratus. Photograph- 

 ic and Photo-Micro- 

 graphic Apparatus and 

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Spectacles, Eye 

 Glasses, Opera and 

 Marine Glasses, etc. 



Illustrated Price List 

 mailed free to any ad- 

 dress. Mention Science 

 n corresponding with us. 



E. & H. T ANTHONY & CO. 

 591 Broadway, N.Y. 



Manufacturers and Importers of 



PHOTOGRAPHIC INSTRUMENTS, 



Apparatus and Supplies of every 

 description. Sole proprietors of 

 the Patent Detective, Fairy, Nov- 

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 Celebrated Stanley Dry Plates. 

 Outfits in great variety, from $9.00 u pwa rd. 

 Catalogue or call and examine. : 

 .rs established in this line of business. 



;nd for 

 I 40 yea 



WHITALL'S PLANISPHERES OR DI- 

 RECTORY OF THE STARRY HEAVENS 

 name and locate all Stars. Constellations, and 

 Planets visible at any given minute of time. 

 Should be used by every one. Ask your sta- 

 tioner, or address Wm. T. Cooper, Manager, 

 307 Race St., Philadelphia, Pa. 



Readers of Science 



Corresponding with or visiting Advertisers 

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TO EMPLOYERS. 



Having purchased the fixtures, good win, &c., of 

 the NEW YORK EMPLOYMENT BUREAU, at No. 

 681 BROADWAY, in this city, we request the pat- 

 ronage of the public In the future. We desire to 

 fill a long-felt want for an employment bureau, 

 where only the best grade of male help is dealt In, 

 and It is our aim to send ONLY such help as is or- 

 dered in every instance, and our patrons can rely 

 on us to send strictly flrst-classhelp, the references 

 of whom we personally investigate before sending 

 to any one. We simply request a trial, and are con- 

 vinced that we will give sailsfaction in every case. 

 We have on hand help tn every branch, which we 

 can send upon receipt of telegram or letter, AND 



NEW YORK EMPLOYMENT BUREAU, 



(AS KEOKGANIZKD). 



