It is known that the early Indians carried on some trade in bark canoe building materials, as they did in stone for weapons and tools. Areas in which some materials were scarce or of poor quality might thus obtain replacements from more fortunate areas. Fine quality bark, "sewing" roots, and good spruce gum had trade value, and these items were sold by some of the early fur traders. Paint does not appear to have been used on early canoes, except, in some instances, on the woodwork. This use occurred mostly in the East, particularly among the Beothuks in Newfoundland. Paint was apparently not used on birch bark until it was introduced by white men in the fur trade. Summary It will be seen that the Indian gathered all materials and prepared them for use with only a few simple tools, most of which could be manufactured at the building site and discarded after the work was completed. The only other tools he usually brought to the scene were those he normally required in his everyday existence in the forest. Some instruments used in canoe building, however, might be preserved; these were the measuring sticks on which were marked, by notches, certain measurements to be used in shaping a canoe. Also, some Indians used a building frame that shaped the bottom in plan view. These are best described when the actual building methods are examined. [Illustration: Figure 21 BUILDING FRAME FOR A LARGE CANOE. Dotted lines show change in shape is caused by omitting crossbars or by using short bars in ends. Note lashing at ends and method of fastening thwart with a thong.] _Chapter Three_ FORM AND CONSTRUCTION Classification of the types of bark canoes built by the Indians is not a simple matter. Perhaps the most practical way is to employ the tribal designation, such as Cree canoe, Micmac canoe, accepting as a criterion the distinctive general appearance of the canoes used by each tribe. It must be emphasized, however, that this method of classification does not indicate the model, or "lines," employed. Both the model and the size of bark canoes were extensively affected by the requirements of use: lake, coastal, or river navigation; smooth, rough, or fast-running water; transportation of a hunter, a family, or cargo; the conditions and length of portages; and the permanence of construction desired. Canoes of various models, sizes, methods of construction, or decoration might be found within the limits of a single tribal classification. Also, within a given area, there might be apparent similarity in model among the canoes of two or three tribal groups. However, a classification based on geographical areas has been found to be impractical, because the movements of tribal groups in search of new hunting grounds tend to make tribal boundaries difficult to define. _Form_