1^0^ z 



SCIENCE 



New Series. 

 ■Vol. VII. No. 175. 



Friday, May 6, 1898. annoal shSeiptmn, ss.oo. 



General Electric Co.'s 



FLUOROSCOPES 



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



NEW X=RAY TUBE *'™virurR'H»i.ATOR. 



SIMPLE. EFFICIENT. LONG-LIVED. 



ROENTGEN RAY APPARATUS of all kinds. 



Catalogue No. 9050. 



Candelabra, Miniature and Decorative Lamps. 



Catalogue No. 9044. 



EOisoQ M\M and liiniatuie im Departwt, 



{GENERAL ELECTRIC COMPANY.) 



HARRISON. N. J. 



MODELS OF BRACHIOPODS pAS;^ S^ThLI^ch'^^k. 



EMBRYOINIC SXAGKH of Cistella neapolitma in ten models from the protem- 

 tjrjo to tbe pliylemtoryo. 



DORS * L VAI.VES of ten important genera sliowing hinge structure, arm supports, etc., 

 averaging 2; j inelies in diameter. 



Price of Complete Series in handsome case, S70; \rtthout case, gSO; Dorsal Valves, SoO ; 

 Embryonic Stages, Sli 



WARD'S MTURAL SCIEKE ESTABLISHMENT, 18-28 College Ave., Rochester. S.Y. 



MAX KOHLb^ Chemnitz^ Cerxnany^ 



FIRST EUROPEAN MAKER OF 



Physical and Electrical Instruments 



Special Manufacturer of Koentgen X-Kay Outfits. 



Apparatus for Experiments \\it\\ Currents of High Frequence and Tension. 



Apparatus for the Experiments according to Hertz. 



Apparatus for Marconi's "Wireless Telegraphy. 



Price List No. 10 of Phvslcal 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 for complete 

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



a^ REFERENCES FROM LEADING EXPERTS.'m. 



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



