SCIENCE.— AD YERTISEMENTS. 



c^bsotutely Reliable Alivayt, 



cmin^ton 



Standard Typewriter. 



NEW MODELS. 



Wyckoff, Seamans & Benedict, 



327 Broadway, New York. 



Drink 



Horsford's Acid Phosphate 



with water and sugar only, makes a de- 

 licious, healthful and invigorating drink. 

 Allays the thirst, aids digestion, and 

 relieves the lassitude so common in 

 midsummer. 



Dr. M. H. Henry, New York, says: "When 

 completely tired out by prolonged wakefulness 

 and overwork, it is of the greatest value to me. 

 As a beverage it possesses charms beyond any- 

 think I know of in the form of medicine." 



Descriptive pamphlet free on application to 

 Rumford Chemical Works, Providence, R. I. 



Beware of Substitutes and Imitations. 



MAX KOHI47 Chexnnifz^ Grermany^ 



FIRST EUROPEAN MAKER OF 



Physical and !EIectrical Instrniiients 



Special Manufacturer of Roentgen X-Bay Outfits. 



Apparatus for Experiments with Currents of High Frequence and Tension. 



Appai'atus for the Experiments according to Hertz. 



Apparatus for Marconi's Wireless Telegraphy. 



Price List No. 10 oi Physical Instruments; nearly 400 pages and more than 1300 engravings (in German, English 

 and French). Special List of X-Ray Apparatus containing numerous testimonials as well as estimates for complete 

 outfits, explicit directions for use, etc., in English language. 



SS- REFERENCES FROM LEADING EXPERTS. 'm- 



Representaiive : Messps. EIMER & AMEND, 205-211 Third Avenue, New York. 



L, 



Established 

 1882. 



COMPLETE LABORATORY EQUIPMENT OF OUR OWN MANUFACTURE. 

 X-RAY APPARATUS AND CROOKE'S TUBES A SPECIALTY. 



Incorporated 

 1894. 



Catalogue P Free to Scliool 

 Officials and Science Teachers. 



ZIEGLER ELECTRIC CO., 



141 Franklin St.. BOSTON, MASS. 



' Duty Free " Importations from 

 Foreign Manufacturers. 



MINERALS. 



Extra Fine Cabinet Specimens. 



Rare Species. Loose Crystals. 



Cheap Educational. Specimens. 

 Systematic Collections. 



Blowpipe Minerals by the Pound. 

 Our Slock greatly enriched by Mr. English's Recent Tour of Europe. \A'rlte for full particulars, and for free 

 Price Lists and Bulletins. 124 pp. Catalogue (S7 cuts) describing every species, 25c. in paper, 50c. in cloth. 



GEO. L. ENGLISH & CO.. Mineralogists, 64 E. 12tli St., New York. 



