  The talk consists of three parts. ``History'' briefly describes the emergence
and evolution of the concept of photon during the first two decades of the 20th
century. ``Mass'' gives a short review of the literature on the upper limit of
the photon's mass. ``Charge'' is a critical discussion of the existing
interpretation of searches for photon charge. Schemes, in which all photons are
charged, are grossly inconsistent. A model with three kinds of photons
(positive, negative and neutral) seems at first sight to be more consistent,
but turns out to have its own serious problems.
