Few number systems contain as many as three numerals which are associated with 6 as their base.

In nearly all instances we find such numerals singly, or at most in pairs; and in the structure of any system as a whole, they are of no importance whatever.

For example, in the Pawnee, a pure decimal scale, we find the following odd sequence:[213] 6.

shekshabish.
7.

petkoshekshabish = 2-6, _i.e._ 2d 6.
8.