The wood of arborvitæ is soft, brittle, light and weak; it is very inflammable. The fact that it is durable, even in contact with the soil, permits its use for railway ties, telegraph poles, posts, fencing, shingles and boats. However, the trunk is so shaped that it is seldom used for lumber, but oftener for poles and posts, the lower section being flattened into ties. A cubic foot of the seasoned wood weighs approximately nineteen pounds. The heartwood is light brown, becoming darker with exposure; the sapwood is thin and nearly white, with fine grain. The northern white cedar varies greatly in size and shape, depending on the soil, climate, and situation. Though it is usually associated with swamps in the North, it adapts itself to quite different situations. It grows in narrow, rocky ravines, on stony ridges, and it clings to the faces of cliffs, or hangs on their summits as tenaciously as the western juniper of the Sierra Nevada mountains. However, little good timber is produced by this species on rocky soils. Trees in such situations are short, crooked, and limby. The wood of the northern white cedar possesses a peculiar toughness which is seen in its wearing qualities. A thin shaving, such as a carpenter’s plane makes, may be folded, laid on an anvil, and struck repeatedly with a hammer, without breaking. It is claimed for it that it will stand a severer test of that kind than any other American wood. Toughness and wearing qualities combined make it an admirable wood for planking and decking for small boats. Its exceptionally light weight is an additional factor as a boat building material. The Indians knew how to work it into frames for bark canoes. Its lightness appealed to them; but the ease with which they could work it with their primitive tools was more important. It is a characteristic of the wood to part readily along the rings of annual growth. The Indian was able to split canoe ribs with a stone maul, by pounding a cedar billet until it parted along the growth rings and was reduced to very thin slats. The property of this cedar which appealed to the Indians is disliked by the sawmill man. It is hard to make thin lumber that will hang together. The tendency to part along the growth rings develops wind-shake while the tree is standing. About nine trees in ten are so defective from shake that little good lumber can be made from them. It is a common saying, which probably applies in certain localities only, that a thousand feet of white cedar must be sawed to get one hundred feet of good lumber. It is good material for small cooperage such as buckets, pails, and tubs, and has been long used for that purpose in the northern states.