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 is naturally shortest, and the Lake Carriers’ Association, a federation of the freighting steamship owners, acting in the river St Mary. Car ferries run through the winter across lake Michigan and the Strait of Mackinac, across the rivers St Clair and Detroit, and across the middle of lakes Erie and Ontario. The largest of these steamers is 350 ft. long by 56 ft. wide, draught 14 ft., horse power 3500, speed 13 knots. She carries on four tracks 30 freight cars, with 1350 tons of freight. Certain passenger steamers run on lake Michigan, from Chicago north, all the winter.

The level of the lakes varies gradually, and is affected by the general character of the season, and not by individual rainfalls. The variations of level of the several lakes do not necessarily synchronize. There is an annual fluctuation of about 1 ft. in the upper lakes, and in some seasons over 2 ft. in the lower lakes; the lowest point being at the end of winter and the highest in midsummer. In lake Michigan the level has ranged from a maximum in the years 1859, 1876 and 1886, to a minimum nearly 5 ft. lower in 1896. In lake Ontario there is a range of 5 ft. between the maximum of May 1870 and the minimum of November 1895. In consequence of the shallowness of lake Erie, its level is seriously disturbed by a persistent storm; a westerly gale lowers the water at its upper end exceptionally as much as 7 ft., seriously interfering with the navigation of the river Detroit, while an easterly gale produces a similar effect at Buffalo. (For physiographical details see articles on the several lakes, and .)

There is geological evidence to show that the whole basin of the lakes has in recent geological times gradually changed in level, rising to the north and subsiding southwards; and it is claimed that the movement is still in gradual progress, the rate assigned being ·42 ft. per 100 m. per century. The maintenance of the level of the Great Lakes is a matter of great importance to the large freight boats, which always load to the limit of depth at critical points in the dredged channels or in the harbours. Fears have been entertained that the water power canals at Sault Ste Marie, the drainage canal at Chicago and the dredged channel in the river Detroit will permanently lower the levels respectively of lake Superior and of the Michigan-Huron-Erie group. An international deep-waterway commission exists for the consideration of this question, and army engineers appointed by the United States government have worked on the problem. Wing dams in the rivers St Mary and Niagara, to retard the discharges, have been proposed as remedial measures. The Great Lakes are practically tideless, though some observers claim to find true tidal pulsations, said to amount to 3 in. at spring tide at Chicago. Secondary undulations of a few minutes in period, ranging from 1 to 4 in., are well marked.

The Great Lakes are well stocked with fish of commercial value. These are largely gathered from the fishermen by steam tenders, and taken fresh or in frozen condition to railway distributing points. In lakes Superior and Huron salmon-trout (Salvelinus namaycush, Walb) are commercially most important. They ordinarily range from 10 to 50 ℔ in weight, and are often larger. In Georgian Bay the catches of whitefish (Coregonus clupeiformis, Mitchill) are enormous. In lake Erie whitefish, lesser whitefish, erroneously called lake-herring (C. artedi, Le Sueur), and sturgeon (Acipenser rubicundus, Le Sueur) are the most common. There is good angling at numerous points on the lakes and their feeders. The river Nipigon, on the north shore of lake Superior, is famous as a stream abounding in speckled trout (Salvelinus fontinalis, Mitchill) of unusual size. Black bass (Micropterus) are found from Georgian Bay to Montreal, and the maskinonge (Esox nobilior, Le Sueur), plentiful in the same waters, is a very game fish that often attains a weight of 70 ℔.

.—E. Channing and M. F. Lansing, Story of the Great Lakes (New York, 1909), for an account of the lakes in history; and for shipping, &c., J. O. Curwood, The Great Lakes (New York, 1909); U.S. Hydrographic office publication, No 108, “Sailing directions for the Great Lakes,” Navy Department (Washington, 1901, seqq.); Bulletin No. 17, “Survey of Northern and North-western Lakes,” Corps of Engineers, U.S. War Department, U.S.

Lake Survey Office (Detroit, Mich., 1907); Annual reports of Canadian Department of Marine and Fisheries (Ottawa, 1868 seqq.).

 GREAT MOTHER OF THE GODS, the ancient Oriental-Greek-Roman deity commonly known as (q.v.) in Greek and Latin literature from the time of Pindar. She was also known under many other names, some of which were derived from famous places of worship: as Dindymene from Mt. Dindymon, Mater Idaea from Mt. Ida, Sipylene from Mt. Sipylus, Agdistis from Mt. Agdistis or Agdus, Mater Phrygia from the greatest stronghold of her cult; while others were reflections of her character as a great nature goddess: e.g. Mountain Mother, Great Mother of the Gods, Mother of all Gods and all Men. As the great Mother deity whose worship extended throughout Asia Minor she was known as Mā or Ammas. Cybele is her favourite name in ancient and modern literature, while Great Mother of the Gods, or Great Idaean Mother of the Gods (Mater Deum Magna, Mater Deum Magna Idaea), the most frequently recurring epigraphical title, was her ordinary official designation.

The legends agree in locating the rise of the worship of the Great Mother in Asia Minor, in the region of loosely defined geographical limits which comprised the Phrygian empire of prehistoric times, and was more extensive than the Roman province of Phrygia (Diod. Sic. iii. 58; Paus. vii. 17; Arnob. v. 5; Firm. Mat. De error., 3; Ovid, Fasti, iv. 223 ff.; Sallust. Phil. De diis et mundo, 4; Jul. Or. v. 165 ff.). Her best-known early seats of worship were Mt. Ida, Mt. Sipylus, Cyzicus, Sardis and Pessinus, the last-named city, in Galatia near the borders of Roman Phrygia, finally becoming the strongest centre of the cult. She was known to the Romans and Greeks as essentially Phrygian, and all Phrygia was spoken of as sacred to her (Schol. Apollon. Rhod. Argonautica, i. 1126). It is probable, however, that the Phrygian race, which invaded Asia Minor from the north in the 9th century, found a great nature goddess already universally worshipped there, and blended her with a deity of their own. The Asiatic-Phrygian worship thus evolved was further modified by contact with the Syrians and Phoenicians, so that it acquired strong Semitic characteristics. The Great Mother known to the Greeks and Romans was thus merely the Phrygian form of the nature deity of all Asia Minor.

From Asia Minor the cult of the Great Mother spread first to Greek territory. It found its way into Thrace at an early date, was known in Boeotia by Pindar in the 6th century, and entered Attica near the beginning of the 4th century (Grant Showerman, The Great Mother of the Gods, Bulletin of the University of Wisconsin, No. 43, Madison, 1901). At Peiraeus, where it probably arrived by way of the Aegean islands, it existed privately in a fully developed state, that is, accompanied by the worship of Attis, at the beginning of the 4th century, and publicly two centuries later (D. Comparetti, Annales, 1862, pp. 23 ff.). The Greeks from the first saw in the Great Mother a resemblance to their own Rhea, and finally identified the two completely, though the Asiatic peculiarities of the cult were never universally popular with them (Showerman, p. 294). In her less Asiatic aspect, i.e. without Attis, she was sometimes identified with Gaia and Demeter. It was in this phase that she was worshipped in the Metroön at Athens. In reality, the Mother Goddess appears under three aspects: Rhea, the Homeric and Hesiodic goddess of Cretan origin; the Phrygian Mother, with Attis; and the Greek Great Mother, a modified form of the Phrygian Mother, to be explained as the original goddess of the Phrygians of Europe, communicated to the Greek stock before the Phrygian invasion of Asia Minor and consequent mingling with Asiatic stocks (cf. Showerman, p. 252).

In 204, in obedience to the Sibylline prophecy which said that whenever an enemy from abroad should make war on Italy he could be expelled and conquered if the Idaean Mother were brought to Rome from Pessinus, the cult of the Great Mother, together with her sacred symbol, a small meteoric stone reputed to have fallen from the heavens, was transferred to Rome and established in a temple on the Palatine (Livy xxix. 10-14). Her identification by the Romans with Maia, Ops, Rhea, Tellus 