1 Young and Living Oceans.- 2 The Earth, a Heat Engine.- 3 The Ridges — Cradles of the Ocean.- 4 Submarine Exploration.- 5 Ophiolites — or in Search of Lost Oceans.- 6 Mantle Metallurgy.- 7 The Forges of Vulcan in the Kingdom of Neptune.- 8 From Rifts to Fast-Spreading Ridges.- 9 The Major Pulsations of the Earth.- Source of Illustrations.