In the past it has been postulated that there should be an inverse relationship between grain boundary segregation and solid solubility. The suggestion was that the same forces that tend to reject a solute from the solid during freezing and thus to decrease its solubility in the solid would be the same forces that would tend to reject a solute from the grain interior to the grain boundary. Although this inverse relationship may exist at a qualitative level, an analysis of two sets of data suggest that quantitatively it is not valid.