, or ebb of tide.
This phrase, implying a previous flow of tide towards high-water, requires here only a partial explanation: the sea, after swelling for about six hours, and thus entering the mouths of rivers, and rising along the sea-shore more or less, according to the moon's age and other circumstances, rests for a quarter of an hour, and then retreats or ebbs during the next six hours. After a similar pause the phenomenon recommences, occupying altogether about twelve hours and fifty minutes. A table of the daily time of high-water at each port is requisite for the shipping. There are curious variations to this law, as when strong rivers rise and fall, and yet do not admit salt water. Their currents, indeed, of fresh water, are found far off the land, as in the Tiber, and off several in the West Indies, South America, &c. (See tide.)