CONTENTS. 



Purpose of the Microscope; Simple and Compound Micro- 

 scopes; Lenses; To Determine the Focus of a Lens; 

 Magnifying Power; Spherical Aberration; Chromatic 

 Aberration. 



SIMPLE MICROSCOPES. 



Coddington Lenses; Aplanatic Triplet; Hastings' Triplet; 

 Reading Glass; Bruecke Lens; Stands and Holders; 

 How to Use Magnifiers and Dissecting Microscopes; 

 Magnifying Power; To Determine Magnifying Power. 



THE COMPOUND MICROSCOPE. 



Description of Parts; A, Base; B, Pillar; C, Arm; D, Body; 

 E, Nose-Piece; Society Screw; F, Objective; G, Eyepiece 

 or Ocular; H, Draw-Tube; I, Collar; J, Coarse Adjust- 

 ment; K, Milled Heads; L, Fine Adjustment; M, Stage; 

 N, Clips; Centering Screws; O, Mirror; P, Mirror-Bar; 

 Q, Substage; R, Substage Bar; S, Diaphragm; Optical 

 Axis; Object; Slide or Slip; Cover Glass; Classification 

 of Microscopes; Tube Length; Stage; Revolving Stage; 

 Glass Stage; Mechanical Stage; Nose-Piece; Double 

 Nose-Piece; Bodies or Tubes; Coarse Adjustment; Fine 

 Adjustment; Draw-Tube; Base; Joint for Inclination; 

 Mirror and Mirror-Bar; Diaphragm. 



