  Evidence of $\psi(3770)$ decays to a non-${D \bar D}$ final state is
observed. A total of $11.8 \pm 4.8 \pm 1.3$ $\psi(3770) \to \PPJP$ events are
obtained from a data sample of 27.7 $\rm {pb^{-1}}$ taken at center-of-mass
energies around 3.773 GeV using the BES-II detector at the BEPC. The branching
fraction is determined to be $BF(\psi(3770) \to \PPJP)=(0.34\pm 0.14 \pm
0.09)%$, corresponding to the partial width of $\Gamma(\psi(3770) \to \PPJP) =
(80 \pm 33 \pm 23)$ keV.
