PART I. 



HISTORY OF THE INVENTION AND IMPROVEMENTS 

 OF THE MICROSCOPE. 



CHAPTER I. 



PAGE 

 HISTORY OP THE MICROSCOPE 1 



CHAPTER II. 



MECHANICAL AND OPTICAL PRINCIPLES INVOLVED IN THE CON- 

 STRUCTION OP THE MICROSCOPE LENSES MODE OF ESTI- 

 MATING THEIR POWER, ETC. ACHROMATIC LENSES MAGNI- 

 FYING POWER WOLLASTON'S DOUBLET CODDINGTON'S LENS 

 ROSS'S SIMPLE AND COMPOUND MICROSCOPES QUEKETT ? S, 

 WARINGTON'S, BAKER'S, AND POWELL'S MICROSCOPES 

 MICROMETERS, ETC 15 



CHAPTER III. 



PRELIMINARY DIRECTIONS ILLUMINATION ACCESSORY APPA- 

 RATUS ACHROMATIC ILLUMINATOR GILLET'S CONDENSER 

 COLLECTING OBJECTS MODE OF INJECTING PREPARING 

 AND MOUNTING OBJECTS POLARISED LIGHT CAMERA 

 LUCIDA BINOCULAR INSTRUMENT PHOTOGRAPHIC DRAW- 

 ING, ETC 69 



