  Earlier work on quantum revivals is extended to Maxwell fields (aka spin-one
singletons). An evaluation of the Casimir energy on the generalised Einstein
universe is also done to illustrate the utility of the Barnes zeta--function
and generalised Bernoulli polynomials. Contact is made with some recent
calculations in AdS/CFT. In particular. higher order singletons are considered
with the Casimir energy being a polynomial in the order.
