M^^ ^ ;7 f* 



SCIENCE 



.New Series. 

 Vol. V. No. 128. 



Friday, June 11, 1897. 



Single Copies, 15 cts. 

 Annual Sdescription, S5.00. 



Queen St Co 



Queen 



Continental li. 



Microscope. 



The most complete and 

 compact outfit for medical 

 and biological research at 

 a moderate price. 



No. 3170. 



Cont. Microscope II., 2 

 oculars, triple nose-piece, 

 Abbe Condenser and iris 

 diaphragm, objectives I in., 

 i in. and ^j "^ (homo. im. 

 1.35 N. A). In polished 

 hardivood case, 



$95.00 net. 



Photo-micrographs of B. 

 Anthracis and E. of Ty- 

 phoid Fever made vrith 

 this' lens (xV °'') will be 

 sent to those who write for 

 it and mention "Science." 



THE NEW QUEEN A" 



(Same as included in 3170). 

 Homogeneous Immer- 

 sion 1.35 N. A. 

 Price $40.00. 



Queen Cont. II. 



WHAT THEY SAY OF IT. 



Washington. Nov. 12tti, 1896. 

 Queen & Co., Inc. 



Dear Sirs .-—It is with the 

 greatest pleasure I send you a 

 testimonial as to the worth of 

 your iV homogeneous oil-im- 

 mersioii objective, which I re- 

 cently tested. 



I gave it a thorough trial, 

 both for ordinary laboratory 

 work and for photo-micro- 

 graphy: it compares favorably 

 in definition with the best 

 European - made objectives, 

 and gave the flattest field in a 

 photo-micrograph of any ob- 

 jective in my possession. 



Very truly yours, 



W. M. Gray, M. D., 

 Microscopist, Army Medical 



Museum. 



Phila., Nov. 27th, 1896. 

 Mess. Queen & Co., Inc. 



Dear Hirs : —It gives me 

 pleasure to say that I have 

 carefully examined your new 

 iVhomo. immersion objective 

 and found its performance ex- 

 ceedingly fine, especially as to 

 flatness of field and color cor- 

 rection. I am surprised that 

 you can sell so good a lens for 

 the price asked. 



I wish you all success with 

 the uew objective. 



Yours verv truly, 



D. D. Stewart, M. D. 



PHYSICAL AND CHEMICAL APPARATUS. 



ELECTRICAL TEST INSTRUMENTS. 



The New Queen 5elf=Regulating X=Ray Tube. 



CATALOGUES AND CIRCULARS ON APPLICATION. 



Queen St Co., inc.. 



N. Y. Office, 116 Fulton St. 1010 Chestuut Street, Philadelphia. 



