APPENDIX. H5 



The MICROSCOPE. These may be had in the form of simple 

 lenses, from Is. 6d. to 7s. Or mounted in brass as a com- 

 pound and single Microscope, from i 1 6s. to 1 7s. 

 The Microscope is a very generally useful and interesting 

 instrument to the observers of nature, and particularly to the 

 Botanist, the Cristallographist, and Mineralogist. 



Great improvements have been made of late years by the 

 use of garnet in forming lenses of very high powers. These 

 are now made so high as 555 of an inch focus. 



The Spherical, or bird eye object glass, by Coddington, 

 forms a very fine compound or single Microscope, having a 

 large field, great distinctness, and veiy high power. 



The Microscope doubled, prepared by the late Dr Wollas- 

 ton, forms also a very powerful instrument, with these lenses. 

 The minute lines on the scales of the wing of the White But- 

 terfly and Podura, distant from each other less than the so;^oo 

 of an inch, are most distinctly seen. 



All these forms of lenses are attached to the best Micro- 

 scopes ; also Micrometers divided upon glass to l ^ of an inch, 

 by which very small objects may be measured. 

 BALANCE, for ascertaining the specific gravity of minerals; 



may be had good, of a small size, for ,1 Is. 

 BLOWPIPES, for fusing minerals, from 2s. to 8s. 



MlNERALOGICAL HAMMERS, of various S1ZCS. 



FORCEPS, PLATINUM CUPS, CALLIPERS, PARALLEL RULES, and 

 PROPORTIONAL COMPASSES, &c. &c. 



