BAUSGH & LOMB OPTICAL 60., 
Microscopes, Telescopes, 
PHOTOGRAPHIC LENSES, 
And other Optical Instruments. 
Factory and Office: ROCHESTER, N. ¥.—531-548 N. St. Paul St. 
Branch Office: NEW YORK—48-50 Maiden Lane. 
Eleventh edition of illustrated catalogue, with a number of improvements and addi- 
tions in the line of microscopes, will be sent free on application to any person interested 
in microscopy. 
HERBERT R. SPENCER & CO., 
GHENEevA, W. = 
MICROSCOPE OBJECTIVES 
OF THE HIGHEST GRADE. 
oe a 
i ject ‘They are 
We call particular attention to our Homogeneous Immersion Objectives. THEY 
e, and long working distance. These ob- 
to be unrivalled. To those 
« Professional ” 
constructed on a new formula, are of wide ang) 
inent microseopists t 
J€ctives have been genegts ’ by em 
bjectives wecal recommend nar 
Wikhine « os “ x 
a 5 2 —e grades. 
and “Student's” series as of the very best — for their respect 
Weg Pe, 3 ? ‘¢ é niform im quality. 
se latin ey 
Price-list and circulars free on application. 
