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PAET I. 



HISTOEY OF THE INVENTION AND IMPROVEMENTS 



OF THE MICROSCOPE. 



CHAPTER 1. 



HISTORY OF THE INVENTION AND IMPROVEMENTS OF THE 

 MICROSCORE 



PAGE 



CHAPTER 11. 



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 — MICROSPECTROSCOPY — 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 



