In its first 20 numerals it is quinary (see p. 141), and as a system must be regarded as quinary-vigesimal.
Any number system which passes the limit 10 is reasonably sure to have either a quinary, a decimal, or a vigesimal structure.
The foregoing examples will show with considerable fulness the wide dispersion of the quinary scale.
This leads the quinary into the vigesimal scale, and produces the combination so often found in certain parts of the world.
In its structure the quinary is the simplest, the most primitive, of the natural systems.
The quinary element does not disappear, but merely sinks into a relatively unimportant position.
Associated words: quinary, quintuple, quintuplicate, quincunx.
Above 20 the systems become vigesimal, with a quinary or decimal structure appearing in all numerals except multiples of 20.
It is quite within the bounds of possibility that the prehistoric nations of Europe possessed and used a quinary numeration.
But even then the universality of quinary counting for primitive peoples is by no means established.