  The paper provides a new test of convergence and divergence of positive
series. In particular, it extends the known test by Margaret Martin
[%\emph{Bull. Amer. Math. Soc.} \textbf{47} (6), 452--457 (1941)]. \emph{Bull.
Amer. Math. Soc.} \textbf{47}, 452--457 (1941)].
