Microscopical Essays* 



65 



C H A P. IIL 



A Description of the most approved Microscopes, 

 and the Method of using them. 



IN the preceding chapter I have endeavoured to give a com- 

 prehenfive view of the theory of the microfcope, and the 

 principles on which the wonderful effecls of this inftrument de- 

 pend. I (hall now proceed to defcribe the various inftruments 

 themfelves, their apparatus, and the moil eafy and ready mode of 

 applying them to ule ; fele&ing for defcription thofe, that from 

 fome peculiar advantage in their conftruclion, or from the repu- 

 tation of the authors who have recommended and ufed them, are 

 in molt general ufe. What is laid of thefe will, I hope, be 

 fufficient to enable the reader to manage any other kind that may 

 fall in hit way. 



Description of Adams's improved 

 Lucernal Microscope, Fig. 1, 



This microfcope was originally thought of, and in part ex- 

 ecuted by my father ; I have, however, fo improved and altered 

 it, both in contagion and form, as to render it altogether a 

 different inftrument. The approbation it has received from the 

 moll experienced microfcopic obfervers, as well as the great 



1 demand 



AND UNIVERSAL 



Plate III. 



