SCIENCE 



New Series. 

 Vol. VII. No. 163. 



Friday, February 11, 1898. f^^l,TS;^L'S., 



Queen Induction Coils 



SEND FOR CATALOQUES: 



264. Queen X=Ray Apparatus. 

 274. New Physical Apparatus. 



1=20. Physical Laboratory Supplies, tms is not a catalogue of instm- 



ments, but its 175 pages are devoted entirely to supplies and general laboratory fittings, such as wire, bat- 

 teries, beakers, burners, connectors, binding posts, thermometers, lenses, mirrors, etc., etc. It is a much 

 more complete index to our extensive stock than we have before been able to place before the public. As 

 it is alphabetically arranged, it is very easily referred to. A copy should be in every Physical Laboratory. 

 It will be sent on request to teachers of Physics. 



Queen & Co., incorporated, 



optical and Scientific Instrument Worl<s, 



1010 Chestnut Street, 



I— Philadelphia. 



NEW YORK OFFICE: 



116 FULTON STREET 



