  In Parikh and Wilczek's original works, the laws of black hole thermodynamics
are not referred and it seems that there is no relation between Hawking
radiation via tunnelling and the laws of black hole thermodynamics in their
works. However, taking examples for the R-N black hole and the Kerr black hole,
we find that they are correlated and even consistent if the tunnelling process
is a reversible process.
