  The DONUT collaboration has observed four events in a hybrid emulsion
spectrometer consistent with tau neutrino charged-current interactions. The
resulting tau lepton is identified by its decay into a single charged particle.
The expected background of charm decays and secondary interactions is .34 +/-
>.05 events. The probability that all tau neutrino candidates are due to
background proceesses is 1.1 x 10-4.
