X CONTENTS. 



Page 



Economic light produced and applied by Messrs. Enderby colour of 

 flame, its diversity how occasioned rose-coloured light produced 

 by positive electricity, by Mr. Abraham, of Sheffield . . 16, 17 



Gravitation chlorine a compound, nitrous oxide gas compounds of 

 nitrogen action on fibrine bleaching properties of chlorine 

 evidence of its composition muriatic acid aqua regia . .18 



Homogeneous gases resist liquefaction chlorine gas reduced to the liquid 

 state alkalescent matter, properties, colour, yellow bleaching 

 property of iodine . . . .19 



Alkalies (in excess) .produce yellow light bromine the alkalies 



sodium, sulphuret of, nitrate of, phosphate of phosphate of silver . 20 



Borate of soda, action on vegetable blues potassium action of alkalies 

 potassium inflammable in oxygen, in chlorine gas, mineral 

 chameleon . .21 



Hydrogen produces malleability in metals blue (hydrogen) ray most 

 refrangible least density coolest portion of spectrum why ? 

 hydrogenating and magnetizing powers authorities produces 

 faint light specific gravity presence essential in all liquids con- 

 stitutes malleability of metals . .22 



Terrestrial light Nature of phosphorus Gold resists action of ter- 

 restrial light, why ? Hydrogen extinguishes ignited bodies, 

 on what account ? Inflammation of oxygen and hydrogen light 

 feeble, heat intense, on addition of alkalescent earth produces 

 splendid light Phosphorus . . . . .23 



Positive and negative electricity Oxygen-positive electricity Gravita- 

 tion, hypothetical system of Sun and its atmosphere . . 24 



Magnetic attraction Immense magnetic power produced by Professor 



Faraday, &c. . . . . . .25 



Carbon a compound Vegetable origin of the diamond Sir David 



Brewster . . . . . . .26 



Diamond a compound Lateral adhesion Crystals : glass Adhesive 

 attraction dependent on polarity that of compound molecules pro- 

 duces greatest fixity and cohesion Qualities of compounds depend 

 on polar arrangement . . . . 27, 28 



All solids compound Forms of crystalline bodies . . .29 



Innate law of conformation Spherical form of atoms, proved by 

 liquids Metals in fusion Transition of sphere to cube, and angu- 

 lar forms in solids . . . . . .30 



Native copper, arborescent and cubical Primitive form of crystals 

 Parallel between colour and sound, by Mr. Field in his ^Esthetics, 

 1819-20, and by Mr. Gurney's Lectures, 1823 . . 31, 32 



