This translation is entitled La Disme enseignant facilement expedier par Nombres Entiers sans rompuz tous Comptes se rencontrans aux Affaires des Hommes.
To Napier seems to be due the first use of the decimal point in arithmetic. Decimal fractions were first introduced by Stevinus in his tract La Disme, published in 1585, but he used cumbrous exponents (numbers enclosed in circles) to distinguish the different denominations, primes, seconds, thirds, &c. Thus, for example, he would have written 123.456 as 123@4050603.
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