Charles H. Spurgeon on Psalms 77:19

Thy way is in the sea, and thy path in the great waters, etc. Until lately, not much was known of oceanic currents, nor of their influences on the condition of particular localities and the intercourse of man with man. They are now seen to be the way or path of the Creator in the great waters. Numerous agencies tend to the production of these currents. Amongst them we may reckon the propagation of the tide wave in its progress over the globe, the duration and strength of certain winds, the variations in density which seawater undergoes in different latitudes, and at different depths, by change of temperature, and the quantity of salt it contains, and by the hourly alterations of atmospheric pressure which take place within the tropics. The oceanic currents are nearly constant in breadth, crossing the sea in many directions. Long bands of seaweed carried by the currents shew at once their velocity, and the line of demarcation between the waters at rest and the waters in motion. Between the tropics there is a general movement of the sea from east to west, called the equatorial current, supposed to be due to the trade winds, and the progress of the tide wave. There are narrower currents carrying warm water to higher and cold water to lower latitudes. Edwin Sidney, in "Conversations on the Bible and Science." 1860.