  The worldvolume field equations of M-branes and D-branes are known to admit
p-brane soliton solutions. These solitons are shown to saturate a BPS-type
bound on their p-volume tensions, which are expressed in terms of central
charges that are expected to appear in the worldvolume supertranslation
algebra. The cases we consider include vortices, `BIons', instantons and dyons
(both abelian and non-abelian), and the string boundaries of M-2-branes in the
M-5-brane.
