  Solute dispersion due to an instantaneously released source in steady,
laminar, axisymmetric flows with an axial inflow and radial outflow is
investigated analytically. Attention is given to large-time characteristics of
dispersion, where the concentration reduces in proportion to $e^{-2\lambda
\tau}$, where $\lambda$ is an eigenvalue that depends on the axial inflow and
$\tau$ is the time measured in units of axial-diffusion times. Prospects of
some other flows are also considered.
