In several elements of culture they had marked differences from the tribes of the adjacent mainland. Their canoes were of bark or of skins stretched on frames, and were in the shape of a crescent, so that they required ballast to prevent them from upsetting. The winter houses they constructed were large conical lodges thirty or forty feet in diameter, having a frame of light poles upon which was laid bark or skins, generally the latter. Hunting and fishing provided them with food, and they have left the reputation of irreclaimable savages. They had no dogs, and the art of pottery was unknown; yet they were not unskilled as artisans, carving images of wood, dressing stone for implements, and tanning deerskins for clothing. An examination of their language discloses some words borrowed from the Algonkin, and slight coincidences with the Eskimo dialects, but the main body of the idiom stands alone, without affinities. Derivation was principally if not exclusively by suffixes, and the general morphology seems somewhat more akin to Eskimo than Algonkin examples.[80] 3. THE ATHABASCANS (TINNÉ). Few linguistic families on the continent can compare in geographical distribution with that known as the Athabascan, Chepewyan or Tinné. Of these synonyms, I retain the first, as that adopted by Buschmann, who proved, by his laborious researches, the kinship of its various branches.[81] These extend interruptedly from the Arctic Sea to the borders of Durango, in Mexico, and from Hudson Bay to the Pacific.