r 



THE TIDES. 



Correspondence between the Tides and Phases of the Moon shown by Kepler. Erroneous popular 

 Notion of the Moon's Influence. Actual Manner in which the Moon operates. Influence of the 

 Sun. Combined Action of the Sun and Moon. Spring Tides. Counter-action of the Sun and 

 Moon. Neap Tides. Priming and Lagging of the Tides. Discussions at the British Associa- 

 tion. Whewell's Researches. Effect of Continents and Islands on the Tides. General Progress 

 of the Great Tidal Wave. Velocity of the Tidal Wave. Eange of the Tide. 



