This signal is made by causing three or more columns of smoke to
ascend, and signifies danger or the approach of an enemy, and also
requires the concentration of those who see them. These signals are
communicated from one camp to another, and the most distant bands are
guided by their location. The greater the haste desired the greater
the number of columns of smoke. These are often so hastily made that
they may resemble puffs of smoke, and are caused by throwing heaps of
grass and leaves upon the embers again and again.
[Illustration: Fig. 339.--Signal of successful war-party.]