The similarity of complex designs, combined with dissimilarity of interpretation, justifies a comparison of simpler forms. These might be believed to have originated independently; hut the sameness of the complex forms proves that their component elements must have had a common origin, or at least have been assimilated by the same forms. One of the striking examples of this kind is the cross. Among the Arapaho it 
Fig. 7. Shoshone Parfleche Design. signifies almost invariably the morning star. To the mind of the Shoshone it conveys the idea of barter. The Sioux recognizes in it a man slain in battle and lying flat on the ground with arms outstretched. The Thompson Indians of British Columbia recognize in it the crossing trails at which sacrifices are made.
The simple straight red lines with which skin bags are decorated are another good example. A specimen was collected by Dr. Kroeber among the Arapaho (Figs. 8a and 8b) in which he explains the stripes on the beaded design on the narrow sides and on the flaps of the bag as camp-trails; the shorter transverse stripes intersecting these longitudinal lines, as ravines, that is, camping-places. On the front of the bag the horizontal lines of quill-work, which resemble the lines on buffalo-robes, are paths. Bunches of feathers on these lines represent buffalo-meat hung up to dry. Adjoining the bead-work are small tin cylinders with tufts of red hair; these represent pendants or rattles on tents. Mr. St. Clair obtained the following explanation of a Shoshone bag of almost identical design: The porcupine-quill work on the front of the bag represents horse-trails. The red horsehair tassels at each side are horses stolen by people of one village from those of another, the villages being represented by the bead-work at the sides of the bag. The bead-work on the flap represents the owners of the horses indicated by the horse-hair tassels on the flap. Among the Sioux the same design is used in the puberty ceremonial, and symbolizes the path of life.
It must not be believed that the interpretation of a certain motive, or even of a complex figure when used by the members of one tribe,
