XVI CONTEXTS. 



Paga 



Limits and method of exposition of the physical description of the 



universe 37 



Considerations on the terms physiology and physics 39 



Physical geography 40 



Celestial phenomena 45 



The natural philosophy of the ancients directed more to celestial 



than to terrestrial phenomena 47 



The able treatises of Varenius and Carl Bitter 49 



Signification of the word Cosmos 51 



The domain embraced by cosmography 53 



Empiricism and experiments 57 



The process of reason and induction 61 



GENERAL REVIEW OF NATURAL PHENOMENA. 



Connection between the material and the ideal world 63 



Delineation of nature 65 



Celestial phenomena 67 



Sidereal systems 73 



Planetary systems 75 



Comets 85 



Aerolites 97 



Zodiacal light 127 



Translatory motion of the solar system 135 



The milky way 141 



Starless openings 143 



Terrestrial phenomena 145 



Geographical distribution 153 



Figure of the earth 155 



Density of the earth .... . 161 



Internal heat of the earth 165 



Mean temperature of the earth 1G7 



Terrestrial magnetism 169 



Magnetism 177 



Aurora Borealis 187 



Geognostic phenomena 197 



Earthquakes 199 



Gaseous emanations 215 



Hot springs 217 



Salses 223 



