  Resistivity, thermoelectric power and heat capacity are investigated in the
ferromagnetic superconductor RuSr2GdCu2O8 with and without Zn substitution. The
thermodynamic signatures of the ordering of the Ru moments and the paramagnetic
Gd moments as well as the onset of superconductivity are all clearly seen and
quantified. The materials are shown to exhibit bulk superconductivity which
coexists with spatially-uniform ferromagnetism. They appear to be typical
underdoped superconducting cuprates in which the pseudogap dominates
normal-state transport, thermodynamic and substitutional properties. However, a
field-induced increase in Tc could suggest some degree of triplet pairing.
