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R. & J. BECK, 



MANUFACTURING OPTICIANS. 



68, CORNHILL, LONDON, E.G. 



1016, CHESTNUT ST., PHILADELPHIA, U.S.A. 



FACTORY: 



LISTER WORKS, HOLLOWAY, LONDON, N. 



MICROSCOPES, 



MICROSCOPE OBJECT-GLASSES, 



PHYSIOLOGICAL PREPARATIONS, 



AND ALL 



Materials and Instruments for Mounting 

 Objects, and for Students' Use, 



ILLUSTRATED CATALOGUES 



AND 



DESCRIPTIVE PAMPHLETS 



Of tte Cheaper Forms of Microscopes forwarded upon 

 Application to 



68, CORNHILL, LONDON, E.G. 



