  We have studied numerically the evolution and decay of axion strings. These
global defects decay mainly by axion emission and thus contribute to the
cosmological axion density. The relative importance of this source relative to
misalignment production of axions depends on the spectrum. Radiation spectra
for various string loop configurations are presented. They support the
contention that the string decay contribution is of the same order of magnitude
as the contribution from misalignment.
