THE ORBITAL AND SOLAR TIDES. n 



hemisphere; and from the September equinox to the 

 December solstice it acts in conjunction with the flow 

 of the annual tide in the southern hemisphere. 



After each of the solstices the solar tide ceases to 

 act in conjunction with the annual tide, but turns to 

 flow back towards the equator, separating from its 

 conjunction with the direction of the annual tide, 

 which latter changes its direction at the equinoxes. 



At the September equinox the solar tides are at 

 the equator, and the annual tide at its culminating 

 point in the northern hemisphere; and immediately 

 after the September equinox, the annual tide tends to 

 fall southwards, the counter-solar tide at the same 

 time falling northwards from the equator. So that 

 in the northern hemisphere at that period these two 

 tides are suddenly brought into opposition : the one 

 rushing southwards towards the equator, and the 

 other rushing northwards from the equator. 



At the March equinox the solar tides are again at 

 the equator, but the annual tide is then at its cul- 

 minating point in the southern hemisphere ; and im- 

 mediately after the March equinox the annual tide 

 tends to fall northwards, the counter-solar tide at the 

 same time turning southwards from the equator. So 

 that in the southern hemisphere at that period these 

 two tides are suddenly brought into opposition: the 

 one rushing northwards towards the equator, and the 

 other rushing southwards from the equator. 



170. Therefore, at the September equinox, when the 



