  The average polarization properties of conal single and double profiles
directly reflect the polarization-modal structure of the emission beams which
produce them. These average properties require that the circulating subbeam
systems which produce conal beams entail paired PPM and SPM emission elements
which are offset from each other in both magnetic azimuth and magnetic
colatitude.
  A clear delineation of the modal polarization topology of the conal beam
promises to address fundamental questions about the nature and origin of this
modal emission--and the modal parity at the outer beam edges is a fact of
considerable significance. The different angular dependences of the modal
``beamlets'' suggests that the polarization modes are generated via propagation
effects. This argument may prove much stronger if the modal emission is
fundamentally only partially polarized. Several theories now promise
quantitative comparison with the observations.
