62 HEAT SOLAR AND TERRESTRIAL. 



CHAPTER VI. 



HEAT SOLAR AND TERRESTRIAL. 



olar and Terrestrial Heat Position of the Earth in the Solar 

 System Heat and Light associated in the Sunbeam 

 Transparency of Bodies to Heat Heating Powers of th? 

 Coloured Rays of the Spectrum Undulatory Theory 

 Conducting Property of the Earth's Crust Convection 

 Eadiation Action of the Atmosphere on Heat Rays 

 Peculiar Heat Rays Absorption and Radiation of Heat by 

 dissimilar Bodies Changes in the Constitution of Solar 

 Beam Differences between Transmitted and Reflected Solar 

 Heat Phenomena of Dew Action of Solar Heat on the 

 Ocean Circulation of Heat by the Atmosphere and the 

 Ocean Heat of the Earth Mean Temperature Central 

 Heat Constant Radiation of Heat Rays from all Bodies 

 Thermography Action of Heat on Molecular Arrangements 

 Sources of Terrestrial Heat Latent Heat of Bodies 

 Animal Heat Eremacausis Spheroidal State Cold 

 Condensation Freezing Theories of Heat Natural Phe- 

 nomenaand Philosophical Conclusion. 



WE receive heat from the sun, associated with light ; and 

 we have the power of developing this important principle 

 by physical, mechanical, and chemical excitation, from 

 every kind of matter. Our convictions are, that the 

 calorific element, whether derived from a solar or a 

 terrestrial source, presents no essential difference in its 

 physical characters ; but as there are some remarkable 

 peculiarities in the phenomena, as they arise from 

 either one or the other source, it will assist our compre- 

 hension of this great principle, if we consider it under 

 the two heads. 



Untutored man finds health and gladness in the 

 warmth and light of the sun ; he rears a rugged altar, 



