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Pacific Ocean or South Sea is the largest of the divisions of the ocean, including about half of the water surface of the globe and covering more than one third of the whole earth. It is 7,000 miles long, and its greatest breadth is 10,000 miles, with an area of 56,000,000 square miles. It is deeper than the Atlantic, averaging about 2,530 fathoms. There are two trade-winds, blowing almost constantly, one from the northeast and the other from the southeast, on which the surface currents of the ocean depend. Along the equator is a region of calms, and north and south of the trade-winds there are belts of calms. A cold current from the flows along the coasts of South America, and a warm current from the equator flows west, dividing into two branches; one known as the Japan or north equatorial current flows north past, resembling in its effects the  in the Atlantic; the other turns south and flows along the shores of  and. (See ).

The largest American river flowing into the Pacific is the, 2,000 miles long, emptying into ; besides this are the Fraser, Columbia, and Colorado Rivers. The rivers of South America flowing into this ocean are only mountain streams, as the Andes Mountains approach so closely to the coast. The rivers of, however, that flow into the Pacific are among the largest in the world, including the Amur, Hoang-ho, , Mekong and Menam. The coasts of America and Australia bordering on the Pacific are generally mountainous, though the shores of Alaska are low and swampy, and the southern part of South America is broken with bays and islands. The Gulfs of California, Panama and Guayaquil are the most important gulfs of the Pacific on its American coast. The coasts of Asia are low and fertile, with many gulfs, bays and groups of islands. Bering, Okhotsk, Japan, Yellow and China Seas are formed by the peninsulas and islands on the Asiatic coast.

The Pacific is remarkable for its myriad small islands and groups of islands. On the American coast are Vancouver, Queen Charlotte, Prince of Wales and others in British America;, the islands on the coast of and the Aleutian Islands; the islands of , , Philippine Islands, , , ,  and  are Asiatic islands, while in mid-ocean are many groups of volcanic origin. The Hawaiian, Ladrone, Marshall and Gilbert Islands in the North Pacific and the, Society, Fiji and Friendly (or Tonga) Islands are the principal of these island groups.

The Pacific was first seen (1513 ) by Europeans from a mountain in, by Balboa, a Spaniard. Magellan, making his way through the Strait of Magellan, was the first European to sail it (1520). He named it Pacific, because of its quiet waters. The first English navigator that explored it for any distance was Sir Francis Drake. The northwest passage through the into the Pacific was discovered by Sir Robert McClure in 1850, and the northeast passage in 1874 by Nordenskjöld.

Pack′ard, Alpheus Spring, an American naturalist, was born at, Feb. 19, 1839, graduated from Bowdoin in 1861, and became assistant to Agassiz at Cambridge. After taking part in several scientific expeditions, he became state entomologist of and professor of zoology and geology at Brown University. He was widely known as an entomologist and zoologist; founded and for about 20 years edited The American Naturalist; and for five years (1877–82) was a member of the national entomological commission. During the Civil War he was assistant surgeon to the Maine Volunteers, and for about a year did much service in the field. Afterwards, for a time, he was librarian and custodian of the Society of Natural History at. He also for a number of years was curator and a director at Peabody Institute, and an authority on agricultural insect pests. He died in 1905. Besides many technical papers, his publications include Guide to the Study of Insects, Our Common Insects, Zoology, Entomology for Beginners, Text-Book of Entomology, The Mammoth Cave, Life History of Animals, Half Hours with Insects, Observations on Glacial Phenomena, Insects Injurious to