Radiation of Heat by Gases. Calorescence. Action of Heat of High Refrangibility. 

 Formation of Clouds. Colour and Polarisation of the Sky. Smoke and Dust 

 Respirator. Colour of Water. Dust and Smoke. Light and Radiant Heat. 

 Acoustic Transparency and Opacity of the Atmosphere. Acoustic Reversibility. 

 Optical Condition of the Atmosphere. The Vital Resistance of Putrefactive and 

 Infective Organisms. Fog Signals. Radiant Heat and Sound. Action of 

 Molecules on Radiant Heat. Radiation. The Rainbow. Living Contagia. 



JOHN HALL GLADSTONE, 



Professor Royal Institution from 1874 to 1877. 



The Copper-Zinc Couple. Chemical Decomposition. Influence of Chemical 

 Constitution on the Refraction of Light. 



LORD RAYLEIGH, 



Professor Royal Institution from 1887 to 1905 ; Honorary Professor, 1905. 



Water Jets and Water Drops. Colours of Thin Plates. Diffraction of Sound. 

 Iridescent Crystals. Foam. Applications of Photography. Physical Work of 

 Faraday. Composition of Water. Interference Bands. Densities of Oxygen and 

 Hydrogen. Scientific Work of Tyndall. Argon. Investigations on Argon. Limits 

 of Audition. Experiments with the Telephone. Transparency and Opacity. 

 Scientific Work of Young. Flight. Polish. Interference of Sound. Drops and 

 Surface Tension. Shadows. The Law of Pressure of Gases below Atmosphere. 



JAMES DEWAR, 



Professor Royal Institution from 1877 to the present date. 



Temperature of the Sun and Work of Sunlight. Physiological Action of 

 Light. Electro- Photometry. Liquefaction of Gases. Spectroscopic Investigations. 

 High Temperature Investigations. Origin and Identity of Spectra. Researches of 

 Henri Sainte-Claire-Deville. Electric Arc and Chemical Synthesis. Researches on 

 Liquefied Gases. Liquid Air and the Zero of Absolute Temperature. Researches 

 on Meteorites. Light as an Analytic Agent. Phosphorescence and Ozone. 

 Optical Properties of Oxygen and Ozone. Scientific Work of Joule. Chemical 

 Work of Faraday in Relation to Modern Science. Magnetic Properties of Liquid 

 Oxygen. Liquid Atmospheric Air. Scientific Uses of Liquid Air. Phospho- 

 rescence and Photographic Action at Low Temperatures. New Researches on 

 Liquid Air. Properties of Liquid Oxygen. Liquid Air as an Analytical Agent. 

 Liquid Hydrogen. Solid Hydrogen. Gases at the Beginning and End of the 



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