R. & J. BECK, 



MANUFACTURING OPTICIANS, 



Philadelphia, Penna., 



Beg to call the attention of 

 microscopists to the following 

 NEW apparatus. 



The Scholar's Microscope. 

 Complete, .... $25.00 



The Lithological Micro- 

 scope. 



Complete in case . . Sno.oo 



The "Ideal" Microscope. 



Monocular, complete, $ 85.00 

 Binocular, " 110.00 



The Improved National 

 Microscope. 



Monocular, complete, $120.00 

 Binocular, " 150.00 



Photographic Attachment 



Microscope. 

 Price, $18.00 



BECK'S NATIONAL MICROSCOPE. 



Together with every description of apparatus for the preparation and 

 examination of objects in every department of Natural History. Glass 

 Slips and Covers, Cements, Preservation Media, Dissecting Instruments, 

 Microtomes, Turntables, etc., all of the very best description and at moderate 

 prices. EVERY ARTICLE GUARANTEED. 



Illustrated condensed Price-List of 32 pages mailed FREE, to any address 

 in the world. Full Catalogue of 176 pages, on receipt of 15 cts. in stamps. 



R. & J. BECK, 



No. 1O16 Chestnut St., 



PHILADELPHIA, PENNA. 



