Beginning again, he now repeats his count of 10, either on his own fingers or on the fingers of another.

With the completion of the second 10 the result is announced, not in a new unit, but by means of a duplication of the term already used.

It is scarcely credible that the unit unconsciously adopted at the termination of the first count should now be dropped, and a new one substituted in its place.

When the method here described is employed, 20 is not a natural unit to which higher numbers may be referred.

It is wholly artificial; and it would be most surprising if it were adopted.