LIGHT. 



1. Description of eye, and mode in which light is transmitted to it Ways 

 in which objects are rendered visible. 2. Analogy between the eye 

 and the organ of smelling. 3. Analogy between the eye and the'ear. 

 4. Luminiferous ether. 5. Corpuscular theory Undulatory theory. 

 6. Undulatory theory explained and examined Roemer's discovery 

 of the velocity of light Newton's solution of the amplitude or breadth 

 of the luminous waves Altitude of luminous waves Table of the 

 magnitudes of the luminous waves of each colour. 7. Consideration of 

 the two theories of light. 8. The idea of the undulatory theory enter- 

 tained by Descartes, Hooke, and others The honour of having re- 

 duced the hypothesis to a definite shape attributable to Huygens 

 Dr. Young's mechanical reasoning thereon. 9. Malus discovers the 

 polarisation of light by reflection The theory greatly extended by 

 Fresnel, Arago, Poisson, Herschel, and others. 10. Relation of light 

 and heat Herschel's discovery apparently establishing the inde- 

 pendence of the heating and illuminating effects of the solar rays 

 Berard's experiments. 11. Bodies luminous and non-luminous. 

 12. Transparency and opacity. 



1. AMONG the many marvellous results of the labours of the 

 human mind directed to the discovery of the laws of the physical 

 creation, there is perhaps none which strikes us with more 

 astonishment than the knowledge which has been obtained 

 relating to the qualities and laws of LIGHT. I propose for the 

 present to bring forward the facts which have been disclosed 

 regarding its physical nature and its motion through space, as 

 LARDNEB'S MUSEUM OF SCIENCE. o 193 



No 13. 



