CONTENTS. 



CHAPTER I. 



PAGE 



Introduction - - - - - - l 



CHAPTER II. 



Reflection and Refraction . 4 



Aberrations - - - - 10 



Microscopic Objectives ------ 13 



CHAPTER III. 



The Microscope - - - - - - -16 



j^ 



Achromatic Condenser ------ 29 



Illumination . ' 1 < s . . . . -33 



The Dark Room ..,' '.' .... 49 



CHAPTER IV. 



Mounting Microscopic Objects .... 54 



Section Cutting ------- 65 



Staining -.-..... 68 



CHAPTER V. 



Wet Collodion Process ------ 75 



Hartley's Formulae --.... 81 



To wash the Emulsion - - - - -83 



To flow the plates - - 84 



