  The two theories for magnetic reconnection, one of Sweet and Parker, and the
other of Petschek, are reconciled by exhibiting an extra condition in that of
Petschek which reduces his theory to that of Sweet and Parker, provided that
the resistivity is constant in space. On the other hand, if the resistivity is
enhanced by instabilities, then the reconnection rate of both theories is
increased substantially, but Petschek's rate can be faster. A different formula
from the usual one is presented for enhanced Petschek reconnection.
