Fire retardance is a remarkable feature of redwood. In the early days of logging, when modern machinery was not available, the woodsmen were confronted with the problem of moving tremendously heavy trees. About sixty per cent of redwood is moisture, and what is known as the “butt cut” logs--the first cut above the ground, which is usually sixteen feet in length, will weigh from thirty to fifty tons. In order to move these heavy logs, therefore, it was necessary for the woodsmen to get rid of the bark, the undergrowth and the branches, which, in logging parlance, is known as “slash.” He soon learned that redwood so strongly resists fire that it was entirely safe to set fire to the logged-over field, burning out this slash without any damage whatever to the logs, although they were exposed to a fierce fire for a period of eight to twelve hours. Redwood does burn, but very slowly, and those who are familiar with California redwood know that it is the despair of the camper to endeavor to build a fire with it. Redwood does not contain pitch, the inflammable element in wood, and, in addition, it is extremely porous, quickly absorbing water. These two traits, in addition to the chemical composition of the wood itself, give it the fire retardance quality. Redwood lumber, being light in weight and singularly free from many of the defects so prevalent in other wood, is extremely easy to work. When properly dried it does not shrink, warp or swell. It is capable of producing magnificent tones for interior finish, and some of the most charming homes on the Pacific coast have been made so by reason of the wonderful possibilities of redwood in this respect. Remarkable color-tone finishes are done by acid stains. Redwood is also a specialty wood. It has been used for years by the organ manufacturers in the West for organ pipes, giving eminent satisfaction. For incubators it is particularly desirable, while for concrete form lumber, and particularly in hot sections where the fierce heat of the sun is liable to warp other woods, it gives wonderful service by “staying put.” Redwood is one of the few woods that can be used over again for concrete work. For siding, sheathing, sub-flooring, shingles, window casings and frames, redwood is much used, because of its resistance to decay, both from contact with moisture or dry rot. Redwood’s hardihood, due to the natural acids in the wood, make it so weather-resisting that it will last just as long unpainted as it does painted. However, there is no wood that takes and holds paint better. This is due to the absence of pitch and the porosity of the wood. It also possesses a remarkable resistance to corrosive acids and for this reason is the preferred material for tanks and vats in wineries, breweries, chemical works, mines, tanneries, etc.