LECTURES ON LIGHT. 



CONTENTS: 



LECTURE I. 

 Introduction, - -,---- 2 



LECTURE II. 

 Origin of Physical Theories, - 8 



LECTURE III. 

 Relation of Theories to Experience, - - 18 



LECTURE IV. 

 Chromatic Phenomena produced by Crystals, - - 27 



LECTURE V. 

 Range of Vision and Range of Radiation. - - 34 



LECTURE VI. 

 Spectrum Analyses, - - 41 



