...generally once in twelve hours, when these levels are equal. Baron Humboldt, forty years ago, said — ' The difference ' of level between the Caribbean Sea and the Pacific Ocean docs ' not probably exceed nine feet; and that at different hours in ' the day, sometimes one sea,...

...rises 21 to 27 feet: whilst on the Atlantic shore the rise is scarcely 2 feet. Humboldt says that, " at different hours in the day, .sometimes one sea, sometimes the other, is the more elevated." So that mid-tide, being on a level in both oceans, if there were a clear passage from ocean to ocean,...

...the Atlantic, while the Atlantic is highest at low water by six feet. Baron Humboldt said, in 1809, " the difference of level between the Caribbean Sea...but, on the contrary a most important advantage in a Ship Canal, since it would create a current from the Atlantic to the Pacific during the ebb, and one...

...whilst on the Atlantic shore the rise is scarcely 2 feet. Humboldt says that, " at different hoars in the day, sometimes one sea, sometimes the other, is the more elevated." So that mid-tide, being on a level in both oceans, if there were a clear passage from ocean to ocean,...

...water by .six feet. Baron Humboldt said, in 1809: 'The difference of level between the Carib- . bean Sea and the Pacific Ocean does not, probably, exceed...current from the Atlantic to the Pacific during the el>b, and one from the Pacific to the Atlantic during the flood-title of the Pacilic, anil these alternate...