THE greatest known depth of the ocean is midway between the Island of Tristan D'Acunha and the mouth of the Rio de La Plata. The bottom was here reached at the depth of 46,236 feet, or eight and three-fourths miles, exceeding by more than 17,000 feet the height of Mount Everest, the loftiest mountain in the world. In the North Atlantic Ocean, south of Newfoundland, soundings have been made to a depth of 4,580 fathoms, or 27,480 feet; while depth equaling 34,000 feet, or six and one-half miles, are reported south of Bermuda Islands. The average depth of the Pacific Ocean, between Japan and California, is a little over 2,000 fathoms; between Chili and the Sandwich Islands, 2,500 fathoms; and between Chili and New Zealand, 1,500 fathoms. The average depth of all the oceans is from 2,000 to 3,000 fathoms.—Selected.