PAKT I. 



HISTORY OF THE INVENTION AND IMPROVEMENTS 

 OF THE MICROSCOPE. 



CHAPTER 1. 



3 



HISTORY OP THE INVENTION AND IMPROVEMENTS OF THE 

 MICROSCOPE 



CHAPTER II. 



MECHANICAL AND OPTICAL PRINCIPLES INVOLVED IN THE 

 CONSTRUCTION OF THE MICROSCOPE LENSES MODE OF 

 ESTIMATING THEIR POWER MICROMETERS POLARISED 

 LIGHT CAMERA LUCIDA BINOCULAR INSTRUMENT 

 PHOTOGRAPHIC-DRAWING M1CROSPECTROSCOPY ACHRO- 

 MATIC LENSES MAGNIFYING POWER WOLLASTON'S 

 DOUBLET CODDINGTON'S LENS SIMPLE AND COMPOUND 

 MICROSCOPES QUEKETT'S, ROSS'S, POWELL AND LEA- 

 LAND'S, BAKER'S, PILLISCHER'S, LADDS', MURRAY'S, HIGH- 

 LEY'S, COLLINS'S, AND OTHER MICROSCOPES 15 



