CONTENTS. Vll 



CHAPTER VI. 



PAGE 



THE EXCITING CAUSE OF SOLAR LIGHT AND HEAT 



TRACED TO THE MECHANICAL FORCE OF THE REVOLV- 

 ING HEAVENLY BODIES 46 



Circulating Currents about the Earth excited by its daily Rotation 

 convert it into a great Electro-magnet. The other Planets of 

 our System are similarly excited. The Sun, seven hundred- 

 fold greater than all the Planets, also excited by a swift Rotation 

 on its own Axis ; thus they are all polarized. Electric Cur- 

 rents around the Sun. Intense electric Excitation of the Solar 

 Electro-sphere ; analogous to the Aurora Borealis. Open- 

 ings at Times through the Electro-sphere, constituting " Spots 

 on the Sun." Extent and effects of Solar Spots ; their 

 Relation to the Movements of Compass-needles. Planets are 

 Electro-Magnets. The Sun a Centre of Reaction ; Analogy 

 of the " Calcium Light." Stellar Suns also Centres of Re- 

 action. Each Sun represents the Action on the Electric Ether 

 of all the Planets circling around it. Heat carried off by 

 Electric Currents. Faraday's Metallic Chamber. The Sun 

 as a bright and cheerful Dwelling-place. So long as the 

 Planets revolve, the Sun will shine. 



CHAPTER VII. 



ARTIFICIAL EXCITATION OF LIGHT BY MAGNETO-ELECTRIC 

 MACHINES 55 



The excitation of Light by revolving Magnets strictly analogous 

 to its natural Excitation by the revolving magnetic Planets. 

 Magneto-electric Lighthouses in England and France. Ef- 

 fects of Electric Light equal to those of Sunshine. Mechani- 

 cal Difficulties of Adjustment. Amount of Motive-power re- 

 quired. Conversion of Motive-power into Light and Heat. 

 Extent of Electric Light measured by mechanical Force. 

 The Solar System a sublime Magneto-electric Machine. 



CHAPTER VIII. 



THE SENSORIAL NERVES CONSIDERED AS INSTRUMENTAL 

 TESTS OF PHYSICAL SCIENCE 59 



The Sensorial Nerves modify Solar Reaction. The Signals they 

 transmit unintelligible to the new-born Child. Colors, Odors, 

 Flavors. Inattention to the true Functions of the Nerves a 

 serious Obstacle in the Way of Knowledge. Causes and Effects 



