184 THE TIDAL WAVE OX THE OFF SIDE OF THE EAETH. 



centre of the earth, and C 2 M towards the centre of the moon. 

 Similarly with E 1 . It was clear, therefore, that part of the effect of 

 the moon's attraction at E and at E 1 must tend to produce a low 

 tide at those points, and therefore a high tide at the intermediate 

 points : not only at C 1 but also at C 3 . The problem, however, 

 might be considered, as Mr. J. A. Hardcastle had done in his papers 

 read before the British Astronomical Association, as one of water 

 moving forward in response to the moon's attraction, rather than as 

 one of water directly raised or depressed by it. 



The Eev. John Tuck well said that Lord Kelvin had stated 

 that unless the earth were more rigid than a cannon ball, it would 

 bulge more at the equator than was found to be actually the case. 

 He regarded the earth as a body that had been rendered solid by 

 the immense pressure. 



After some questions and remarks from Colonel Alves, Professor 

 Laxghorxe Orchard and others, a vote of thanks was passed by 

 the Meeting to the Lecturer, who in acknowledging it again pointed 

 out that the moon would cause a lateral pressure on the earth at the 

 points lettered E and E 1 on the diagram. 



The Meeting adjourned at 6.15 p.m. 



