ii 



SCIENCE. 



FOR SALE. 



TO BE SOLD, 



One of the Finest of Microscopes, 



Fresh from the hands of the makers, Messrs. SIDLE & CO., 



of Lancaster, Pa. 



This instrument is Binocular, the latter fitting being capable of 

 entire removal, to permit the full aperture of tube for Minocular 

 vision. 



The Stage is provided with all Mechanical Movements that have 

 been invented, after the latest and improved designs by Tolles, of 

 Boston, and Watson, of England ; and has graduated scales for 

 registering all positions. This stage has at its edge the gonio- 

 metric scale and is as thin as an ordinary, non-mechanical stage, 

 thus permitting the most oblique rays of light to be freely used. 



A second Non Mechanical Stage is supplied for ordinary micros- 

 copical work. 



This fine, new Binocular Microscope is of the highest work- 

 manship and finish, and has been fitted with every knozvn and ac- 

 cepted improvement to date, and is offered as the perfection of a 

 modern complete instrument. With it the most delicate micrometer 

 investigations can be performed, and all experiments of which the 

 microscope is capable be executed zvith ease. 



The instrument is ready for delivery, and can be examined on 

 application at the office of "Science," Tribune Building {Room 17). 



Terms on which it can be obtained forzvarded on application. 



