268 



NEGRETTI AND ZAMBRA, HOLBORN VIADUCT, E.G., 



925. ENGLISH ACHROMATIC OBJECT GLASSES. 



BEST QUALITY. 



s > 



11 



' 



The 



Immersion arrangement to th or th powers, 42s. extra. 



th, ^th, and ^th, are all of the very highest class of Optical 

 workmanship. 



926. SECOND QUALITY. 



Those marked (*) have adjustments for covered and uncovered objects, and all the 

 screws are cut to the Standard Gauge of the London Microscopic Society. 



927 Sets of Achromatic Object Lenses, for Microscopes of French or 



German manufacture, combined focus, 1-inch . . . . 1 C 



Ditto ditto, -inch 150 



Ditto ditto, i-mch 1 10 



