  By calculating the contribution of the $\pi-\pi$ three-body force to the
three-nucleon binding energy in terms of the $\pi N$ amplitude using
perturbation theory, we are able to determine the importance of the energy
dependence and the contribution of the different partial waves of the $\pi N$
amplitude to the three-nucleon force. A separable representation of the
non-pole $\pi N$ amplitude allows us to write the three-nucleon force in terms
of the amplitude for $NN\rightarrow NN^*$, propagation of the $NNN^*$ system,
and the amplitude for $NN^*\rightarrow NN$, with $N^*$ being the $\pi N$
quasi-particle amplitude in a given state. The division of the $\pi N$
amplitude into a pole and non-pole gives a procedure for the determination of
the $\pi NN$ form factor within the model. The total contribution of the
three-body force to the binding energy of the triton for the separable
approximation to the Paris nucleon-nucleon potential (PEST) is found to be very
small mainly as a result of the energy dependence of the $\pi N$ amplitude, the
cancellation between the $S$- and $P$-wave $\pi N$ amplitudes, and the soft
$\pi NN$ form factor.
