elasticity of a very high order.

[Illustration: Fig. 91.--Section.]

In Fig. 92 a simple scheme of plaiting or weaving this material is
suggested. It will be seen to differ from the last chiefly in the way
in which the woof is taken up by the warp.

[Illustration: Fig. 92.--Theoretical device for weaving third group.]

The ancient pottery of the Mississippi Valley furnishes many examples of
this fabric. It is made of twisted cords and threads of sizes similar to
those of the other work described, varying from the weight of ordinary
spool cotton to that of heavy twine. The mesh is generally quite open.

In Fig. 93 we have a very well preserved example from Reelfoot Lake,
Tennessee. It was obtained from a large fragment of coarse pottery.
Other pieces are nearly twice as coarse, while some are much finer.

[Illustration: Fig. 93.--From the ancient pottery of Tennessee.]

Figs. 94 and 95 are finer specimens from the same locality.

[Illustration: Fig. 94. Fig. 95.
From the ancient pottery of Tennessee.]

We have also good examples from Saline River, Illinois. They are
obtained from fragments of the gigantic salt vessels so plentiful
in that locality.