  The decays of a scalar particle, of either parity, into two photons or into
two gravitons are evaluated. The effective interactions are of the form $\phi
FF, \phi F\tilde{F}$ or $\phi RR,\phi R\tilde{R}$; in particular, Higgs boson
decay into gravitons cannot be adduced to an interaction $\phi R$, as has been
recently claimed.
