APPENDIX. 355 



Student's Microscope, with one inch and one -fourth 

 inch objectives (second quality) one ocular, rack and 

 pinion, lever, fine adjustment for focus, sub-stage for 

 Illuminating apparatus, revolving diaphragm, plain 

 and concave mirrors, side stand for illuminating 



opaque objects, black walnut case 90 00 



TOLLES' FIRST CLASS OBJECTIVES. 



Size Degrees. Price. 



1-2 inch, Angle apertured 60 to 90 $40 00 



4-10 " 90 to 120 4500 



4-10 " ik ....135toH5 6500 



1-4 or 1-5 " " .... 120 to 130 4500 



1-4 " 150 55 00 



1-4 ' 180 70 00 



1-6 ' lk 180 75 00 



1-S " .... 180 80 00 



1-10 " " .... 180 85 00 



TOLLES' PATENT SOLID EYE PIECES. 



l-2inch,"D" $800 



1-4 inch 8 00 



Either of the above, for his Student's Microscope 6 00 



Wenham's Reflex Illuminator 1000 



MICEOSCOPE STANDS, BY JOSEPH ZENTMAYER, 147 



SOUTH FOURTH STREET, PHILADELPHIA, PA. 



American Centennial Stand, binocular, with 5 eyepieces $300 00 



Same, but monocular, 3 eye pieces 250 00 



Concentric adjustable stage, extra 20 00 



Best mahogany case, with fine handle and side case 30 00 

 American Histological Stand, with plain and concave 

 mirrors attached to swinging radial bar, carrying, also, 

 sub-stage and diaphragms having three apertures, 1 (B) 



eye piece, no case 30 00 



Extra eye pieces, each 5 00 



NOTE. The following extras can be obtained of Mr. 

 Zentmayer at the prices below given. They are fur- 



