Microscopical Essays. jg 



of light is to be regulated, by railing and lowering the fliding- 

 plate, or the lamp. N. B. This part, with it's lanthorn and 

 lamp, may be had feparate from the lucernal microfcope. 



Apparatus which usually accompanies the improved 

 Lucernal Microscope. 



The ftage for opake objects, with it's femicircular Lump of 

 glafs, and concave mirror. 



The ftage for tranfparent objects, which fits on the upper part 

 of the foregoing ftage. 



The Aiding tube, to which the magnifiers are to be affixed ; 

 one end of thefe is to be fcrewed on the end B of the wooden 

 body ; the magnifier in ufe is to be fcrewed to the other end of the 

 inner tube. 



Eight magnifying lenfes ; thefe are fo conftrucled, that they 

 may be combined together, and thus produce a very great variety 

 of magnifying powers. 



A fifh-pan, fuch as is reprefented at I, Plate IX, 



A fteel wire L, with a pair of nippers at one end, 



A fmall cylinder of ivory 1 at the other. 



A Aider ofbrafs N, containing a flat glafs Aider, and a brafs 

 Aider, into which are fitted fome fmall concave glafies, 



A pair 



