Part 18

Three Forks, Montana, 42, 79; canal system at, 107-111.

Trails, 111, 112.

Transportation of dam and food material, 86-90, 92, 93; canals used in, 106-115; trails and slides used in, 111, 112, 115; tunnels used in, 112-115.

Trappers, 164, 189-191.

Traps, 35, 189.

Trees, cutting. See Cutting trees.

Trimming trees, 12, 96.

Trout, 205, 206.

Tunnels, 85, 112-115, 198, 203, 206.

Water. See Stream-flow.

Water-ouzel, 199.

Water-supply, 85, 86.

Weather-wisdom, 44-47.

Weight, 7.

Wells, food, 103, 104. See also Basins.

Whistle, 26, 37.

Wildcat, 35.

Willow Creek, 176.

Wind River, 102, 175, 182, 188.

Winter, beaver life in, 197-209.

Wolves, gray, 191, 197.

Wood, dead, 143, 144.

Work, accomplished by beaver, 3-5.

Young, birth and care of, 27, 28; growth and play of, 28.

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