222 Capt. Fornian on Dr. Young s and La Place's 



feet ; ami especially at the distance of more than four thousand 

 miles, which alone, one would naturally suppose, would be 

 quite sufficient to exhaust the whole force of tlic pressure. Be 

 tliis, however, as it may, it is clear that if, as you sujipose, the 

 original tide does come from the Southern {3cean, it must visit 

 the southern coasts of the Atlantic before it does the northern ; 

 and the following extracts from a Tide-table evidently prove 

 tliat the very i-everse of this is frequently the case. 



Times of High water on Fall and Change Days. 



In every one of the above extracts, and I might easily have 

 produced as many more, it is evident that the necessary and 

 ftcknoxioledgcd* consequence of your theory is at variance with 

 facts; and I suj^pose you will allow, that a proposition which is 

 at variance with facts cannot possibly be true. Making the 

 proper allowance for the difference in their longitudes, it is 

 higli water at Balta as soon as it is at Bantry Bay, and at 

 Bayonne even before it is at Oporto; and yet, if the tide did 

 come from the southward, it evidently could not reach the two 

 former places until it had passed the two latter. It is evident 

 from this, that the tides in the North Atlantic Ocean do not 

 come from the Southern Ocean; and, in order to anticipate 

 every objection that can be brought against my theory, I shall 

 liow show that they are not ])rochiccd by any pressure in tlie 

 Atlantic Ocean, that uiay be occasioned b}- one portion of the 

 waters being heavier than another. 



Upon the princi]")le of pressure and etjuilibrium, it is clear 

 that twice the depth of ocean will make amends for the loss of 



* " It sends a wave into the Atlantic, wliicii is perhaps twelve or thirteen 

 hours in \\-< passige to the coast of France." — See Z/«y«/r xivii. page r?HO. 



lialf 



