92 Microscopical Essays. 



A pair of forceps. 



A fteel wire, with a pair of nippers at one end, and a point ate 

 the other.. 



A frhall ivory cylinder, to fit on the pointed end of the afore- 

 faid nippers.. 



A convex lens, moveable in a brafs femicirele ; this is affixed to* 

 a long brafs pin, which fits into a hole on the ftage; 



If the reader wants a more particular defcription of any of the 

 articles of this apparatus* he will find it at trie latter end of this; 

 chapter. 



A Description- of the improved Solar Microscope,,. 



WHICH IS CONSTRUCTED TO EXHIBIT TRANSPARENT ANDi 



opake Objects, Fig. i, Plate V. 



The folar microfcope is generally fuppofed to afford the moll- 

 entertainment, on account of the wonderful extent of it's magni- 

 fying power, and the eafe with which feveral perfons may view 

 each fmgle object at the fame time. The ufe of it was, however;, 

 confined for many years only to tranfparent objects. About the 

 year 1774, Mr. B> Martin fo far improved this inftrument, a&toh 

 render it applicable to opake, as well as to tranfparent objects, 

 exhibiting the magnified image of either kind on a large fcreen. 

 Speaking of it himfelf, he fays, "With this inftrument all opake 

 objects, whether of the animal, vegetable, or mineral kingdom, 

 maybe exhibited in great perfection, in all their native beauty; 



