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 11 



Negative and positive oculars 12 



Eye-point 13 



Different types of oculars 15 



Care of oculars 15 



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 



