angles to each other, alternate threads of one series passing over and
under each of the opposing series as shown in the section, Fig. 63.

[Illustration: Fig. 62.--Type of Group one--portion of a coffee
sack.]

[Illustration: Fig. 63.--Section.]

It is a remarkable fact that loosely woven examples of this kind of
cloth are rarely, if ever, found among the impressions upon clay or in
the fabrics themselves where preserved by the salts of copper or by
charring. The reason of this probably is that the combination is such
that when loosely woven the threads would not remain in place under
tension, and the twisted and knotted varieties were consequently
preferred.

It is possible that many of the very irregular impressions observed, in
which it is so difficult to trace the combinations of the threads, are
of distorted fabrics of this class.

This stuff may be woven by hand in a simple frame, or by any of the
primitive forms of the loom.

In most cases, so far as the impressions upon pottery show, when this
particular combination is employed, the warp is generally very heavy and
the woof comparatively light. This gives a cloth differing greatly from
the type in appearance; and when, as is usually the case, the woof
threads are beaten down tightly, obscuring those of the web, the
resemblance to the type is quite lost.