They also made fibre or thread from willow bark.

Their cooking vessels made of this watape not only contained water, but water which was made to boil by putting a succession of hot stones into it.

It would, of course, be impossible to place these vessels of fibre on a fire, and apparently none of the Amerindians of temperate North America knew anything about pottery.
Those that were in some degree in touch with the Eskimo used kettles or cauldrons of stone.

Elsewhere the vessels for boiling water and cooking were made of bark or fibre, and the water therein was made to boil by the dropping in of red-hot stones.

The arrows of these Slave Indians were two and a half feet long, and the barb was made of bone, horn, flint, or copper.