CONTENTS. 



PAET I. 



PAGES 



Introduction - 1-5 



CHAPTEB I. 



THE MICEOSOOPB-STAND. 



On choosing a microscope-stand — Designation of the parts of a 

 microscope — Different forms of feet compared — The stage — 

 Sub-stage and under-fitting — Coarse and fine adjustments 

 — Two-speed fine adjustments — ^The limb — The body-tube 

 — The mechanical draw - tube — Tailpiece and mirrors — 

 Binocular microscopes — Microscopes for dissecting — Micro- 

 scopes for metallurgy — Microscopes for travellers — Micro- 

 scopes for petrology and for preparing and mounting — The 

 selection of a microscope — Testing a microscope - 6-47 



CHAPTER II. 



OPTICAL CONSTRTJCTION. 



Optical definitions — Magnifying power, how produced — Objec- 

 tives, apoohromatic and achromatic — Immersion objectives 

 — Angular and numerical apertures — The apertometer — 

 Correction for thickness of cover-glass — The use of the correc- 

 tion collar — Testing objectives — The Abbe test-plate — Choice 

 of Objectives — Eyepieces: Huyghenian, compensating, 

 holoscopic, Kellner, projection, and binocular — Standard 

 gauges for eyepieces - 48-83 



CHAPTER III. 



ILLUMINATION AND ILLUMINATING APPARATUS. 



Monochromatic light and hght filters — Sub-stage condensers — 

 Aplanatic apertures of condensers — How to use the con- 



