VRICE LIST. 
103 
SEE SECTION. 
73. Fraunhofer’s Stage Screw Micrometer, . 
$40.00 
74. 
Wollaston’s Camera lucida, . 
10.00 
75. 
Nachet’s Camera lucida. 
8.00 
76. 
Soemmering’s Steel Speculum, 
4.00 
80. 
Bull’s-eye condenser on stand. 
6-7.00 
81. 
Smaller ditto, ..... 
5-6.50 
84. 
Lieberkuhn Speculum, .... 
3.00 
85. 
Erector, ...... 
5.00 
80. 
Orthoscopic Eye-piece, .... 
10.00 
87. 
Compressor, ...... 
6.00 
88. 
Animalcule cage with screw. 
4.00 
89. 
Simple animalcule cage. 
2.00 
90. 
Stage Forceps, ..... 
3.00 
Hand Forceps of brass, 
75 
“ “ of steel, .... 
50 
91. 
Frog Plate, 
5.00 
92. 
Instrument for cutting circles of thin glass. 
8.00 
93. 
Instrument for making cells of gold size. 
or other 
fluids, ...... 
3.00 
Extra Eye-piece, No. 1, 2 or 3, 
5.00 
111. 
Tourmalines fitted to Eye-piece, 
4.00 
117. 
Barker’s Selenite Stage, 
10.00 
WE ALSO MAKE THE FOLLOWING 
Optical Instruments for various Scientific Eesearches. 
Crown glass prism of any desired angle, mounted on a small 
brass stand, with two movements, ..... $8.00 
Flint glass prism, mounted as above, 10-15.00 
Prism of rock crystal, do. ...... 15.00 
Prism of Iceland spar, do. ..... . 1 5.00 
Two prisms on one stand, to demonstrate the theory of 
Achromatism, ........ 1 5.00 
Hollow prism for fluids, with variable angle, on stand, . 30.00 
Biot’s prism for volatile liquids, with perfectly piano-parallel 
sides of glass, ’ . 15.00 
Ditto, with two compartments, ...... 20.00 
Ditto, with three compartments, 25.00 
