Ifoyji^r 



SCIENC 



New Series. 

 Vol. VII. No. 172. 



Feiday, April 15, 1898. 



Single Copies, 15 cis. 

 Annual Suesceiptios, So. 00 



General Electric Co.s 



New X=Ray Tube 



WITH AUTOMATIC VACUUM REQULATOR. 



Simple. Efficient. Long-lived. Cannot run too high in vacuum. 



Roentgen Ray Apparatus, catalogue No. 9,050. Minia- 

 ture, Candelabra, Decorative Lamps, catalogue No. 9,044. 



EmsoQ Decoiative anii iQiatDre Laip DeDaitnt. 



(GENERAL. ELECTRIC COMPANY.) 



HARRISON, N. J. 



186 pages, 40 splendid eiigi'avings. Con- 

 tains a table giving name, composition and 

 form of all known minerals, with a supple- 

 ment bringing the work up to date. Metallic 

 classification showing what minerals contain 

 each element. Alphabetical index of names. Lists giving the specimen values of minerals, etc., etc. For teachers, students, 

 collectors, mining experts, chemists, and others. Postpaid ; Paper, 35 cents ; Ctoih, 50 cent.s ; Calf, interleaved, Sl.OO. 



Established 1876 



Complete Mineral Catalogue. 



DR. 



A. E. FOOTE, 1317 Arch Street, Philadelphia, Pa., U.S.A. 



COLLECTIONS OF MINERALS FOR STUDY OR REFERENCE, CABINET SPECIMENS. 



GEMS. 



MAX KOHIi!^ Chemnitz^ GrGFXxiansr? 



FIRST EUROPEAN MAKER OF 



Pkysical and Blectrical Instruments 



Special Manufacturer of Roentgen X-Kay Outfits. 



Apparatus for Experiments with Currents of BUgli Frequence and Tension. 



Apparatus for the Experiments according; to Hertz. 



Apparatus for Marconi's Wireless Telegrapliy. 



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

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

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



jm- REFERENCES FROM LEADING EXPERTS. -&. 



Representative: Messrs. EIMER & AMEND, 205-211 Third Avenue, New York. 



