CONTENTS. 



I. INTRODUCTION 



CHAP. 



PREFACE v vi 



PART I. 

 THEORY OF THE MICROSCOPE. 



II. ANALYTICAL DETERMINATION OF THE PATH OF 



THE RAYS IN REFRACTING SYSTEMS ... ... 9 23 



II. DETERMINATION OF THE DISTANCES OF CORRE- 

 SPONDING IMAGE-POINTS FROM THE AXIS IN 

 THE CASE OF ANY GIVEN INCLINATION OF 

 THE RAYS 24 26 



IV. THE COMPONENT PARTS OF THE MICROSCOPE ... 2750 



1. THE OBJECTIVE 27 34 



2. THE EYE-PIECE: 



a. The Campani (or Huyghenian) Eye-piece 35 42 



b. The Ramsden Eye-piece 42, 43 



c. The Aplanatic and the Orthoscopic Eye- 



piece 4345 



d. The Erecting Eye-piece 45, 46 



e. The Spectral Eye-piece 47, 48 



3. MEANS OF DIVIDING THE PENCILS OF RAYS 4850 



V. CHROMATIC AND SPHERICAL ABERRATION 50 65 



1. CHROMATIC ABERRATION ... 5053 



2. SPHERICAL ABERRATION 53 65 



VI. INFLUENCE OF THE COVER-GLASS 65 68 



VII. THE FLATNESS OF THE FIELD OF VIEW 68 78 



VIII. THE CENTERING OF THE SYSTEMS OF LENSES ... 79 84 



IX. BRIGHTNESS OF THE FIELD OF THE MICROSCOPE .. 84 90 



