  Available data on the luminosities of supernovae of Type Ia (SNe Ia) that
have been calibrated by Cepheids are collected and discussed. The objects in
the present sample show a range of ~20 in luminosity. The data strongly confirm
the suspicion that SNe Ia in early-type systems are, on average, fainter than
those that occur in late-type galaxies. Historical observations of S Andromedae
suggest that the maximum magnitude versus rate-of-decline relationship for SNe
Ia exhibits a large intrinsic dispersion. This is not surprising because the
amount of 56Ni that is produced, and other observable properties of SNe Ia, are
expected to depend sensitively on how much fuel is ignited.
