CONTENTS. 



PREFACE. --v 



INTRODUCTION. ...... jx 



THE MICBOSCOPE. 



What it Is ; What it Does ; Different Kinds of Microscopes ; Essen- 

 tial Parts of the Microscope ; Names of the Different Parts, - 13 



SIMPLE MICBOSCOPES. 



Hand Magnifiers ; Watch-Makers' Eye-Glasses ; Engravers' Glasses ; 

 Coddiugton Lens; Stanhope Lens ; Stands for Simple Micro- 

 scopes ; Raspail's Microscope ; Excelsior Microscope ; Twenty-five 

 Cent Microscopes ; Penny Microscopes ; Craig Microscope ; Fused 

 Globule Microscopes Novelty, Globe, etc., - ... 23 

 COMPOUND MICBOSCOPES. 



French Vertical Microscopes ; the Continental Form ; the Jackson 

 Model ; the Ross Model ; Browning's New Model ; the Inverted 

 Microscope ; the Binocular Microscope ; the Binocular Eye-Piece, 34 



OBJECTIVES. 



Spherical Aberration ; Chromatic Aberration ; Corrected Objectives ; 

 Defining Power ; Achromatism; Aberration of Form; Flatness of 

 Field ; Angular Aperture ; Penetrating Power ; \N orking Distan -e ; 

 Immersion Lenses; L^ns Systems; French TnpLts; Focal 

 Length of tUe Numbers used to Designate Objectives by Nache', 

 Hartuack and Guudlach, ....... -41 



TESTING OBJECTIVES. 



General Rules ; Accepted Standards Diatoms, Ruled Lines, Arti- 

 ficial S ar, Podur* ; Methods of Testing the Various Qualities; 

 Nobert's Lines , Mover's Probe Platte, 58 



SELECTION OF A MICROSCOPE FOR PRACTICAL PURPOSES. 



Must b^ A lapte-l to Requirements and Skill of User ; Microscopes 

 for B t my ; For Pnysicians ; For Students Magnifying .Power 

 Required ; i'he Staud ; Tne Stage Mechanical Stage Revolving 

 Stage; Stages for Special Purposes, Sub-Stage, Mirror. Body; 

 Draw-Cub^; Adjustment for Focussing; The Diaphragm; Ob- 

 jectives ; High versus Low Angles ; Eye-Pieces, 69 



ACCESSORY APPARATUS. 



Stage Forceps ; Forceps Carrier ; Object Holder ; Plain Slides ; Con- 

 cave Slides : Watcu-Gtasses ; Watch-Glass Holder ; Animalcule 

 Cage; Z >"phyte Troug'i Cornpressorium ; Gravity Compressor- 

 iuui ; Growing Slides ; Frog Pldte ; Table ; Double "Nose-Piece, - 93 



ILLUMINATION SOURCES OF LIGHT. 



Sun-Light ; Artificial Light Candles, Gas, Lamps, Magnesium, 

 Oxyhydiogen Lignt ; Parallel, Convergent and Divergent Rays, 107 



ILLUMINATION OF OPAQUE OBJECTS. 



Diffused Light ; Bulls-Eye Condenser ; Side Reflector ; The Lieber- 

 kuim ; Smith's liluuiuiator ; The Parabolic Reflector, - - 111 



