/ Q / --^ -0 C 



New Series. 



Vol. VIII. No. 1S3. 



CIENC 



Friday, July 1, 1898. 



Single Copies. 15 CT3. 

 Annual Subscription, 55.00. 



General Electric Co.'s 



FLUOROSCOPES 



Platino=cyanide of Barium, or Tungstate of Calcium Screens. 



l>ltiW A- IV A I 1 Uoti VACUUM REQULATOR. 



SIMPLE. EFFICIENT. LONG-LIVED. 



ROENTGEN RAY APPARATUS of all kinds. 



Catalogue No. 9050. 



Candelabra, Miniature and Decorative Lamps. 



Catalogue No. 9044. 



Ellsoii Decorative ai pilnlatflre laip Departmeiit, 



(.GENERAL ELECTRIC COMPANY,) 



HARRISON, N. J. 



x^ ■WE HAVE JUST ISSUED 



A MEW SHELL CATALOGUE 



1 AND PRICE LISTS OF MOLLUSCA 



Enlarged to 170 pages. Illustrations Increased to over 200. Contains mnoli Valuable 

 -z Descriptive Matter. Indispensable to Collectors. Price, 40 cents, postpaid. 



i WARD'S NATURAL SCIENCE ESTABLISHMENT, ROCHESTER, N. Y. 



MAX KOHIa^ Ohcmnitx^ Crermansf^ 



FIKST EUROPEAN MAKEK OF 



Physical and Electrical InstnLments 



Special Manufacturer of Koentgen X-Eay Outfits. 



Apparatus for Experiments with Currents of Higli Frequence and Tension. 



Apparatus for the Experiments according to Hertz. 



Apparatus for Marconi's Wireless Telegraphy. 



Price List No. 10 of Phvsical Instruments; ne.arly 400 pages and more than 1300 engravings (in German, Englisli 

 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. 



J^- REFERENCES FROM LEADING EXPERTS. -&!■ 



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



