Abstract
There is observational evidence of the mass loading of flows by ablated material in a variety of circumstellar and interstellar phenomena. Here the strength of this evidence will be evaluated for the flows observed in the hydrogen deficient planetary nebulae A 30 and 78, the cometary knots in the Helix nebula, the hypersonic ``strings'' in the Eta Carinae nebula, the inner shell of the prototypical luminous blue variable star P Cygni, the Honeycomb nebula in the halo of 30 Doradus, and the weak monopolar jets from the M 42 proplyds.
