/(fhf^ s 



SCIENCE 



New Series. 

 Vol. IX. No. 227. 



Friday, May 5, 1899. 



Single Copies, 16 cts. 

 Annual Subscription, $5.C0, 



WIU PAEDTMFR £ PO Astronomical and Physical Apparatus 



If III. UnLnlllLri 06 UU., 152-158 East 56th St., CHICAGO 



AsTsoNOMicflL Telescopes 



Spectroscopes 



michelson interferometers 



SPECIALTIES 



ATus or New and Improved Designs 



roscopes and telescopes dividing engines, comparators 



General Laboratory Apparatus 

 Universal Laboratory Supports 



MINIATURE INCANDESCENT LAMPS. 

 MINIATURE LAMP RECEPTACLES. 

 X-RAY TUBES AND APPARATUS. 

 FLUOROSCOPES -. 



Catalogues on Application. 



Edison Decorative and Miniatare Lamp Department, 



(General. Electric Company,) 



HARRISON, N. J. 



Fossil Corals. 



We now have a large suit of corals from all geologic ages ; both from 

 foreign and American localities. Some of these have been beautifully 

 "~"^"~* cleaned by nature, some have been artificially developed, and still others 

 are cut and polished. Prices range from ten cents up. Write for list of American paliEozoic Acti- 

 nozoa, enumerating 250 species for sale. 



W^ARD'S NATURAL SCIENCE ESTABLISH iMEENT, 



28 to 40 College Avenue. ROCHESTER, N. Y. 



*'Duty Free" Importations 



Correspondence is requested with reference to importation of European Scientific Appa- 

 ratus for Colleges, Universities, and other Educational Institutions. My collection of 

 foreign catalogues is large and constitutes a sort of reference library for the use of 

 intending buyers. Further particulars upon request. 



For laboratory loork, the "Chloride w » \flCC f\ RlP^r^I P 



Accumulator" Storage Battery J Ail'ltio vJ. DlLIL/L.Ci 



is standard. Would he glad to .^.^ . ^^ ...» -■ j- r*i_>i j i ■_• n 



quote you price for a pUmi. 1034 Drexel Buildiiig, Philadelphia, Pa. 



