CONTENTS. 
Optics of the Compound Microscope. Frontispiece 
CHAPTER I. 
Objectives and Oculars. 
Page 
Functions of the objective. i 
Designation of objectives. 2 
Working distance of objectives. 2 
Different kinds of objectives. 3 
The draw-tube.■. 4 
Angular aperture of objectives. 4 
Numerical aperture of objectives. 5 
Immersion objectives. 5 
Variable objectives. 6 
Resolving power. 7 
Illuminating power. 7 
Penetrating power. 7 
Selecting objectives. 9 
Care of objectives. 10 
Function of oculars. ii 
Negative and positive oculars. 12 
Eye-point. 13 
Different types of oculars. 15 
Care of oculars. iS 
Limit of magnification. 16 
Suggestions and cautions. 18 
CHAPTER II. 
Illumination of Objects; Illuminating Devices. 
Different modes of illumination. 20 
Transmitted light. 20 
Condensers, Abbe condensers. 23 
Color of Microscopical objects. 28 
Reflected light. 29 
The Silverman Illuminator. 33 
Dual Illumination. 35 
Dark-field illumination. 36 
Dark-field illuminators. 37 
IX 
