Note 9 — Chapter I · EVOLUTION OF ATLANTIC TELEGRAPHY IN AMERICA AND ENGLAND
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These live near the surface of the ocean in myriads upon myriads, incessantly sinking to the bottom as their short life is ended. Thus, in the course of ages, there grows constantly upward a formation similar to the chalk cliffs of England, which contain the identical shells, deposited when this country was submerged far below sea-level thousands of years ago.