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SCIENCE 



New Series 



Vol. LVI, Xo. 1451 



Friday, October 20, 1922 



Annual Subsceiption, $6.00 

 Single Copies, 15 Ors. 



Bausch & Lomb 



Photomicrographic 



Camera, Type 



A ne^^ photomicrographic camera, for use either horizontally 

 or vertically, with supports thoroughly braced to make it extremely 

 rigid in both positions. The very moderate price at which it is 

 offered places it well within the reach of any school or college 

 laboratory. 



Designed for use with any standard make of compound micro- 

 scope, and can be used in making unusually large photographs, as 

 it accommodates 8 x 10-in. plates. 



Rear camera frame is fitted with reversible 

 back with spring door; front frame equipped 

 with automatic shutter. Supplied with either 

 Mazda or Tungsarc lamps. 



Price, with Mazda lamp and transformer, for 

 110-volt current, without microscope, $235.00 



Our new, complete catalogue of Photomicrographic Emiipment has just come from the 

 press. If you are interested in this apparatus, we will be glad to send you a 



Bausch & Lomb Optical Company 



409 St. Paul Street, Rochester, N, Y. 



New York 



Washington 



Chicago 



San Francisco 



QQT 23 



Leading American Makers of Optical Measuring Instruments, Photomicrographic Apparatus^' piiritAfcra^I.;, . 



Lenses, M.croscopes. Projection Apparatus (BalopUcons),' Ophthalmic * Len^s ^aSir^^str^S^^-ff^^r iV^ 



nd_ Gun-Sights for Army and Navy, Searchlight Reflectors, Stereo-PrismT^"^^-— UH 



Range Finde 



Binoculars, Telescope 



Magnifiers, Automobile 'Lenses and" other""Hi'eh'-'G'rade'^ 

 Optical Products. 



