CONTENTS. XI 



Page 



Analogy of colour and tone . * . 33 



Prismatic colours of terrestrial light Heat and light identical 34, 35, 36 

 Light : Opinions and disputations of Hooke, Huygens, Euler, Newton, 

 &c. Antiphlogistic doctrine of Lavoisier and his opponents, Stahl 

 and others Volcanic and Neptunian systems of geology Agen- 

 cies of both needful . . . .37 

 Consumption of light by absorption Provided for, by restoration of 



matter from a fixed to a radiant state . . . .38 



Velocity of light accounted for . . . .39 



Undulation Gravitation never for a moment suspended . . 40 



Proportions of differential interferences Black lines Attempts to ac- 

 count for Confusion of polarity Black circle Field's lenticular 

 prism Connexion between blue and shade Heat a consequence of 

 light Transmission of heat governed by refraction . 41 46 



Analogy of heat and light by the various experiments of Sir W. Her- 

 schel, Dr. Wollaston, MM. Ritter, Buckman, and De Laroche, 

 Professors Powell and Forbes, Mr. Lloyd, MM. Malus, Berard, 

 Leslie, &c., Mrs. Somerville's Connexion of the Physical Sciences 49 

 Voltaic electricity Professor Faraday's experiments . . .51 



Electricity Mr. Field's chromometer, and the application of his prisms 

 Radiation of caloric Mr. Leslie's scale Chemical changes pro- 

 duced by radiant matter MM. Gay Lussac and Thenard, Dr. Dai- 

 ton, Sir H. Davy, T. Ritter, Dr. Wollaston, and M. Berthollet 

 Maximum of heat at positive pole of Voltaic circle Health of 

 vegetation depends on the presence of light . . 57, 58, 64 



Red ray most reflexible and least refrangible Rays deemed impon- 

 derable Intensity of light depends on repulsive force . . 65 

 Atoms require pressure to produce condensation Undulatory system 



rests on contraction . . . . . .68 



Repulsion of light promotes transition to fixity . . .70 



Heat and light in the atmosphere; the former a modification of the 



latter . . - . . . .71 



Light produced by the agency of electricity . , . .72 



Combustion of ammonia in chlorine . . . .73 



Matter of the simple gases always combined . . .74 



Expansion of matter in a gaseous state . . . .75 



Experiments on solar phosphori . . . . .76 



Combination of specific light with other bodies . . .77 



Conversion of common into radiant matter Sir H. Davy's opinions . 78 

 On one species of matter Newton's observations Sir H. Davy's . 79 

 Evidences submitted in support of the Theory here presented, No. 1 



to 11 80 



