LUMBAGO

rheumatism of muscles of the small of the back, probably an inflammation of the fibrous ti ue of the muscle also affecting the nerves, characterized by intense pain on move- ‘ment; treatment is rest, fomentations on ‘affected part, and a saline laxative, while sodium salicylate, aspirin, counter-irritants, or electricity may be beneficial. ‘See RuzuMATIsM. tion and manufacture of timber for ‘building purposes. It has three branches, logging, or the felling, cutting and transporting of timber to the mill, conducted largely by saw-mill owners or operators; the saw-mill operations, with their output of saw logs and rough lumber, including beams, joists, scantlings, boards, shingles, laths, etc.; and the planing mill. Much of the lumber becomes manufactured, in addition to building equipment, into telegraph poles, shipbuilding material, railroad ties, pulpwood, paving blocks, and wood for furniture There are great logging camps in the timber regions of the United States, where the industry is organized to conform to natural conditions, topography, water and rail transport, and weather. Power logging has highly developed in the Pacific Northwest, where ocean rafting is also common. In 1922 there was a production of 32,000,000 you sand board feet of timber, the chief producing states being Washington, Louisiana, North Carolina, Texas, California, Florida, Wisconsin and Virginia. |The number of active saw mills numbered 29,534. Among a large variety of woods cut, yellow pine led with 13,062,938 you sand board feet, followed by douglas fir, oak, hemlock and white pine in much le quantities. Other woods cut in still le volume were spruce, maple, red gum, cypre , chestnut, redwood, larch, birch, beech, cedar, yellow poplar, white fur, elm, ba wood, hickory, ash, cottonwood, typelo, sugar pine, balsam fir, walnut and sycamore. Redwood is cut only in California, where also sugar pine almost wholly comes. From hardwoods (mostly beech, birch and maple), wood alcohol, charcoal, acetates, tar and tar oils are distilled. Tar and tar oils and charcoal, as well as rosin, turpentine and wood creosote, are distilled from softwoods. For many years past there has been a serious diminution in the supply of lumber in the United States through wasteful cutting (see For us try), and conservation has been resorted to for the protection of the forests. (See CONSERVATION). Other lumbering-producing countries besides the United States are Canada, Ru ia, Sweden, Germany and France, while the tropics, largely through enterprising colonization, furnish much mahogany, ebony, rosewood and other yaluable woods.