Polynesia, Melanesia, and Micronesia, together with the isolated, openocean islands of the Pacific basin, include nearly 3,000 named islands. Not counting New Guinea, New Zealand, and their immediate satellites, the total area of these islands is about 73,000 square (statute) miles, or 189,000 square kilometers. Nearly one-half of the total is covered by a dozen islands, among which are Hawaii, Viti Levu, Vanua Levu, New Pomerania, New Mecklenburg, and New Caledonia. The other islands average only about 12 square miles in area. That part of the ocean basin in which the islands are situated measures 35,000,000 square miles (90,000,000 square kilometers). Hence the complete mapping and investigation of a total land area less than that of the State of Nebraska would bring in practically all the information that can ever be obtained concerning the bedrock geology of one-sixth of the earth’s surface. It is highly . . .