  It is argued that the spectrum of cold dark matter particles on Earth has
peaks in velocity space associated with particles falling onto the Galaxy for
the first time and with particles which have fallen in and out of the Galaxy
only a small number of times in the past. Estimates are given for the sizes and
velocity magnitudes of the first few peaks. The estimates are based upon the
secondary infall model of halo formation which has been generalized to include
the effect of angular momentum.
