  The electron hole asymmetry has been measured in natural graphite using
magneto-optical absorption measurements. A splitting is observed for the
transitions at both the $K$-point and the $H$-point of the Brillouin zone of
graphite where the effect of trigonal warping vanishes. This result is fully
consistent with the SWM Hamiltonian providing the free electron kinetic energy
terms are taken into account. An identical electron-hole asymmetry should be
present in graphene.
