HIBBING, a village of St Louis county, Minnesota, U.S.A., 75 m. N.W. of Duluth. Pop. (1900) 2481; (1905 state census) 6566, of whom 3537 were foreign-born (1169 Finns, 516 Swedes, 498 Canadians, 323 Austrians and 314 Norwegians); (1910) 8832. Hibbing is served by the Great Northern and the Duluth, Missabe & Northern railways. It lies in the midst of the great Mesabi iron-ore deposits of the state; in 1907 forty iron mines were in operation within 10 m. of the village. Lumbering and farming are also important industries. The village owns and operates the water-works and electric-lighting plant. Hibbing was settled in 1892 and was incorporated in 1893. HIBERNACULUM (Lat. for winter quarters), in botany a term for a winter bud; in botanic gardens, the winter quarters for plants; in zoology, the winter bud of a polyzoan. HIBERNATION (winter sleep), the dormant condition in which certain animals pass the winter in cold latitudes. Aestivation (summer sleep) is the similar condition in which other species pass periods of heat or drought in warm latitudes. The origins of these kindred phenomena are probably to be sought in the regularly recurrent failure of food supply or of other factors essential to existence due to the seasonal onset of cold in the one case and of excessively dry hot weather in the other. They are means whereby certain non-migratory species are enabled to live through unfavourable climatic conditions which would end fatally in starvation or desiccation were the animals to maintain their normal state of activity.