OuXI'KNTS. Vll 



Spriiigof Rock-oil Boracic Lagoons Remarkable Natural 

 Barometer Metamorphism of Rocks Experiments of 

 Mitscherlich Chemical Phenomena of Iceland Remark- 

 able -Aspect of the Country Boiling Springs Origin and 

 Explanation of Palagonite Rock Decomposition of by 

 Volcanic Emanations Detection of Sulphuretted Hydrogen 

 Gas by a Cigar Formation of the Geysers Professor Bun- 

 sen's Discoveries Great Geyser Explanation of Coun- 

 tries rising Repose and Activity of the Interior of the 

 Planet, alternate . . . .~ p. 110 



PART II.-THK AIR. 



CHAPTER I. 



ITS PHYSICAL CONSTITUTION. 



The Air travels with the Earth Limits of Air A Journey 

 to the Moon Finite Extent of the Atmosphpre Extreme 

 Rarefaction Gay Lussac's Balloon Ascent Tides in the 

 Air Cause Solar and Lunar Influence Atmospheric 

 Waves Indian Summer Weight of the Air Barometer 

 Weight of dry Air Weight of Water in the Air Effect 

 on Barometer Effect of Pressure Anecdote Results of 

 Pressure Limit to Aerial Navigation Cold of Expansion 

 Machines for Ice-making Line of Perpetual Snow 

 Snowy Mountain in Africa Blueness of the Air Remark- 

 able Instance of Polarised Light The Polar Clock Elec- 

 tricity of the Air p. 165 



CHAPTER II. 



CHEMICAL CONSTITUTION OF THE AIB. 



Oxygen The Fire Annihilator Nitrogen Rude Analysis 

 Eudiometer Accurate Analysis Result Exact Com- 

 position of Air Air taken by a Balloon Air not a Che- 

 mical Compound Physical Constitution Source of Oxy- 

 gen-i Constancy of Composition Carbonic Acid in Air- 

 Proportion Properties Power of Diffusion Effects 

 Coal Gas Ammonia in Air Variation of Nitrogen in 

 Food Source Manures Operation of Effect of Char- 

 coal on a Rose-tret Normal Composition of the Atmo- 

 sphere Properties of Air p. 201 



