  Images of IRAS galaxies with a range of IR properties are examined for bright
knots, both within and outside the galaxy. These are found almost exclusively
in galaxies with steep IR spectra, but over a wide range of IR luminosity, and
usually without strong nuclear activity. In most cases, the knots are likely to
be star-formation induced by tidal interactions, and are seen in the early
stages of such interactions. Detailed photometry is presented of knots in six
representative galaxies. The knots appear to have a wide range of colour and
luminosity, but it is argued that many are heavily reddened. Knots formed
outside the parent galaxy may be a new generation of what later become globular
clusters, but they appear to have a wide range of luminosities.
