  The possible infrared behaviour of the gluon propagator is studied
analytically, using the Schwinger-Dyson equations, in both the axial and the
Landau gauge. The possibility of a gluon propagator less singular than
$1/k^{2}$ when $k^{2} \rightarrow 0$ is investigated and found to be
inconsistent, despite claims to the contrary, whereas an infrared enhanced one
is consistent. The implications for confinement are discussed.
