CONTENTS OF THE CATALOGUE. 



97 



VOL. II. 



Theory of Dioptrics and Catoptrics 

 Optical Instruments in General 

 Photometers 



Measurement of Refractive Powers 

 Measurement of Transparency 

 Catoptric Instruments — 



Lenses 



Optical Scenery 



Microscopes, Simple and Compound 

 Telescopes 

 Micrometers 

 Physical Optics 



Sources of light 



Light from Combustion 



Light attending Decomposition without sensible Heat 



ISpontaneous Light 

 Solar Phosphori 

 Light from Friction 

 Velocity of Light 

 Aberration 

 Decay of Light 



Interception and Partial Reflection of Light 

 Refractive Powers 



Dispersion of Colours by Refraction 



{Total or internal Reflection 

 Tables of Refractive and Dispersive Powers 

 Table of the Order of Dispersive Powers 

 WoUaston's comparative Table 

 Atmospheric Refraction 



Ordinary Atmospheric Refraction, Celestial or Terrestrial 299 



Irregular Atmospheric Refraction ■ 301 



Horizontal Refraction 301 



Irregular Refraction at Various Altitudes 302 



Beams of Light from Atmospherical Refraction 



or Reflection 303 



Observations of Parhelia, or Paraselenes, and Halos303 



|Particular Accounts 303 



Theory of Halos and Parhelia 305 



Glories, or coloured Anthelia SOS 



Simple Rainbows 308 



Double Refraction 309 



Vision in General * "310 



Structure of the Human Eye 311 



Comparative Anatomy of the Eye • '311 



Immediate Functions of the Eye 313 



Perception of external Objects 313 



Shadows 313 



Colours, as affecting the Eye 314 



Aerial Perspective, and Management of Colours 314 



Ocular Spectra, and Coloured Shadows 314. 



Imperfections of Sight 315 



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