Title: The depths of the sea
Subjects: Porcupine (Ship), Lightning (Ship), Marine sediments, Deep-sea temperature, Ocean, Marine animals, Marine fauna, depths, tlie, temperature, fathoms, depth, species, surface, dredge, deep water, north atlantic, bottom temperature, animal life, carbonic acid, cold area, sir john, gwyn jeffreys, organic matter, great depths
Places: Atlantic Ocean, North Atlantic Ocean