xiv (X)N'J'ENTS. 



PART 11. 



USE OF THE MICROSCOPE. 

 CHAPTER I. 



Page 



Peelimtnary Directions 181 



Position '"• 



Adjustment of the light 182 



Transparent objects ib. 



Adjustment of the focus - 183 



Opaque objects 185 



CHAPTER II. 



On the Illumination or Objects 186 



Transparent objects ib. 



Achromatic condenser or Eclairage 189 



Direct light 193 

 Oblique light - - - 194 



Back-ground illumination - ib. 



CHAPl'ER III. 



Opaque Objects - 196 



Lieberkuhn 199 

 Dark stops - 202 



Illuminators of recent construction - ■ 203 



Nobert's illuminator - ib. 



Amici's illuminator - 204 



Annular condenser - 205 



GiUett's condenser - 206 



CHAPTER IV. 



JIlCBOMETEK - 209 



Stage micrometer - - - - 211 



Eye-piece micrometer - - 212 



Cobweb micrometer - - 216 

 On the Measurement of Microscopic Objects - 217 



