We search for new particles that decay into bb-bar and are produced
with W bosons in ppbar collisions at sqrt s = 1.8 TeV.  The search uses 109
+/- 7 pb^-1 accumulated by the CDF experiment at Fermilab.  We select events
with an e nu or mu nu, and two jets, one of them b tagged.  The number of
events and the two-jet mass distribution are consistent with expectations.
Using W + Higgs production as a model for the acceptance, we set an upper
limit on the production cross section times branching ratio for the new
particle ranging from 14 to 19 pb (95% C.L.) as the particle mass varies from
70 to 120 GeV/c^2.