SCIENCE. 



[Vol. XV. No. 368 



Sprague £lectric Railway and Motor Company. 



Lightest Weight Consistent witii- 

 Highest Efficiency, 



SIIVIPLE IN CONSTRUCTION. r 



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. 



"D. & J. "aIderson'S" 



Celebrated SCOTCH ZEPHYRS. 



CHECKS, STRIPES. PLAIDS, and BOU- 



RETTE EFFECTS. 



§pecial novelty n'ill be found in 

 our spriiijs^ coiorings and deisigns. 

 TIiU fabric is un^iurpassed for La- 

 dies' and riiildreii's wear. 



"FRERES KOECHLIN'S" 



PRINTED SATEENS. 

 Jdwoidwciii c\J l^tfo <5t. 



NEW YORK. 



SPRING STYLES 



IN DRESS GOODS. 



Novelties in Wool Cress Fabrics are now 

 ready. Bouclette Plaids and Mixtures with 

 plain goods to match; Cheviot and Tweed Suit- 

 ings in irregular checks and stripes; Cameletta, 

 a new twilled fabric in street shades, made for 

 combination with fancy cloths in various novel 

 devices, These gotds will be found very reason- 

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JAMES McCREERY & CO. 



BROADWAY AND ELEVENTH STREET, 



NEW YORK. 



I Opportunity. Geo. A. Scott, S42 Broadway, N. Y. 



ESTERBROOK'S 

 STEEL PENS. 



OF SUPERIOR AND STANDARD QUALITY. 

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



ITor Sale bij all Stationers. 



THE ESTERBROOK STEEL PEN GO., 



Works : Camden, N. J. -^6 Jolin St.. Sew York. 



PHYSICAL, ELECTRICAL 

 AND CHEMICAL 



APPARATUS 



Of High Grade. 



FOR !!>CHOOL,g AND COLLEGES. 



Send fok List of Catalogues. 



QUEEN & CO., PMladelphia. 



MINERALS. 



Cabinet Specimens and Collections. 



Our stock is very complete in fine specimens for 

 the connoisseur, as well as cheaper specimens for the 

 student and amateur. Complete Catalogue Free. 

 GEO. L,. ENai/ISH &: CO., 



Dealers in Iflinei'als, 

 1512 Chestnut Street, Philadelphia, Pa. 



yi/Sr PUBLISHED. 



POPULAR MANUAL OF VISIBLE SPEECH AND 

 VOCAL PHYSIOLOGY. 



1 Schools. Price 50 cents. 



For U5e in Colleges and Ni 

 Sent free by post by 



N. D. C. HODGES, 47 Lafayette PI; 



, New York. 



If you have 1100, 81.000 or §1,000,000 

 for wliich you are seeking for a profitable 

 investment, -write to James W. Greeis^, 

 West Superior, Wis. 



Inquiry costs nothing. Reference by per- 

 mission to The Editor of Science. 



Readers of Science 



Corresponding with or vi siting Advertisers, 

 will Ci nfer a great favor by mentioning this paper. 



THE 



,]dl Te 



COMPANY. 

 98 MILK ST,, BOSTON, MASS, 



Tbis Company owns the Letters 

 Patent granted to Alexander Gra- 

 ham Bell, Blarch 7th, 1876, Xo. 

 174,465, and January 30, 1877, 

 No. 1§6,787. 



The Transmission of Speech by 

 all known forms of ULECTRIC 

 SPEAKING TELEPHONES in- 

 fringes the right secured to this 

 Company by the above patents, and 

 renders each individual userof tel- 

 ephones, not furnished by it or its 

 licensees, responsible for such un- 

 lawful use, and all the conse- 

 quences thereof and liable to suit 

 therefor. 



H. Wiinderlicli & Co., 



868 BROADWAY, 



NEW \ORK, 



Invite special attention to their latest 

 importations of Modem Etchings, En- 

 gravings, Brown's Carbon Photographs 

 and Watercolor Paintings, also to their 

 large collection of Rare English Mezzo- 

 lints, Fancy Subjects by Bartolozzi, 

 old Line Engravings, and Original 

 Works by Rembrandt, Durer, and other 

 old masters. 



CHANCE FOR ALL 



To Enjoy a Cup of Perfect 

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pounda of Fine Tea, either Oolong- Ja- 

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 of Tea you want. Greatest inducement 

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 brated Teas, Coffees and Baitine Powder. For full particu- 



