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Updated: May 9, 2025
It is always interesting to trace the necessity which directly or indirectly was the parent of a particular invention; and in the great importance of an accurate record of the sea-depth in which a cable is being laid, together with the tedious and troublesome character of ordinary sounding by the lead-line, especially when a ship is actually paying out cable, we may find the requirements which led to the invention of the 'bathometer, an instrument designed to indicate the depth of water over which a vessel is passing without submerging a line.
And the same law holds good as to the marine fauna and flora, each specific form being confined to its own sea-depth, or distance north or south from the thermal equator. : Speaking of the ultimate principles or elements of matter, Plato is quoted by Humboldt as exclaiming with modest diffidence, "God alone, and those whom he loves among men, know what they are."
I must begin, however, ages before the Wealden island existed; when the chalk of which its mass was composed was at the bottom of a deep ocean. We know now what chalk is, and how it was made. We know that it was deposited as white lime mud, at a vast sea-depth, seemingly undisturbed by winds or currents.
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