The experimental information on the search for non qqˉ​ mesons as
glueballs, hybrids and multiquark states is reviewed. Candidate states which
are particularly amenable to detailed study by accumulating large samples of
J/ψ, ηc​, χ decays at a τ-charm factory are discussed.Comment: 25 pages, LaTex, 22 Figures (available from the authors on request),
BARI-TH/94-17