Abstract
An extensive examination of the luminosity-line-width relations as an indicator of extragalactic distances is described. Evidence for significant background contamination in the Virgo Cluster is presented. It is shown that this contamination is responsible for much of the controversy regarding the distance to the Virgo Cluster. The absolute calibration is examined and it appears that the technique is now limited by the uncertainty in the Galactic distance scale. The relation is applied to samples from the Virgo and Ursa Major clusters and the value of Ho is determined. The cosmological time-scale test is used to examine the inflationary hypothesis.
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