Contents. xi 



CHAPTER IX. 



PAGE 



WINDS 59 



Entertained theories erroneous Their true character 

 What gives rise to the currents Purely vito- 

 magnetic phenomena Philosophical considerations 

 drawn from observation Whirlwinds, water- 

 spouts, and tornadoes The Barbadoes Manu- 

 factured wind Wind within a wind Winds may 

 not arise from presumed causes A great cosmical 

 system. 



CHAPTER X, 

 SUN-SPOTS 70 



Old theories Degrees of spot-shadow overestimated 

 --What spots are not, and what they are They 

 are caused by magnetic perturbations Inconsist- 

 ency of accepted theories Figures that are decep- 

 tive Effects of these wonderful phenomena Mis- 

 taken conceptions May not be tabulated Unbi- 

 assed estimate of their character and location. 



CHAPTER XI. 



SOUNDS, AND THEIR TRANSMISSION 77 



Essential character and mode of progression Waves 

 have no act or part in their conveyance. 



CHAPTER XII. 

 SOME OF THE RESULTS OF THE FOREGOING THEORIES. 79 



Extent and character of their influence Old chan- 

 nels obliterated, and new ones developed Senti- 



