Appunti di storia dei logaritmi. II: I logaritmi di Nepero

In this paper, we examine the structure of Napier's logarithms by analysing his main work on the subject, the Mirifici Logarithmorum Canonis Constructio, published poshumously in 1619. We prove the main results by following the original arguments of Napier. Finally, we analyse Napier's logarithmic tables as well as the sources of the radix method, later developed by Briggs.