e horizontal or concentric filaments. Moki work--1/8.]

[Illustration: FIG. 295. Alternation of intersection, producing
oblique or spiral ribs. Piute work--1/8.]

[Illustration: FIG. 296. Radiating ribs as seen in flat work viewed
from above. Moki work--1/4.]

It will be observed, however, that the ridges do not necessarily take
the direction of the warp filaments, for, with a different alternation
of the horizontal series--the woof--we get oblique ridges, as shown in
the partly finished bottle illustrated in Fig. 295. They are,
however, not so pronounced as in the preceding case. The peculiar
effect of radiate and concentric weaving upon the ribs is well shown
in Fig. 296.

By changes in the order of intersection, without changing the type of
combination, we reach a series of results quite unlike the preceding;
so distinct, indeed, that, abstracted from constructive relationships,
there would be little suggestion of correlation. In the example given
in Fig. 297 the series of filaments interlace, not by passing over and
under alternate strands, as in the preceding set of examples, but by
extending over and under a number of the opposing series at each step
and in such order as to give wide horizontal ridges ribbed diagonally.

[Illustration: FIG. 297. Diagonal combination, giving herring bone
effect.]

[Illustration: FIG. 298. Elaboration of diagonal combination, giving
triangular figures.]

This example is from an ancient work basket obtained at Ancon, Peru,
and shown in Fig. 299. The surface features are in strong relief,
giving a pronounced herring bone effect.

[Illustration: FIG. 299. Peruvian work basket of reeds, with strongly
relieved ridges.]

Slight changes in the succession of parts enable the workman to
produce a great variety of decorative patterns, an example of which is
shown in Fig. 298. A good illustration is also seen in Fig. 286, and
another piece, said to be of Seminole workmanship, is given in Fig.
300. These and similar relieved results are fruitful sources of
primitive decorative motives. They are employed not only within the
art itself, but in many other arts less liberally supplied with
suggestions of embellishment.

[Illustration: FIG. 300. Effects produced by varying the order of
intersection. Seminole work--1/8.]

Taking a second type of combination, we have a family of resultant
patterns in the main distinguishable from the preceding.

[Illustration: FIG. 301. Surface effect