The second course of the International School on Physics with Low Energy Antiprotons was held in Erice, Sicily at the Ettore Majorana Centre for Scientific Culture, from May 20 to May 31, 1987. The School is dedicated to physics accessible to experiments using low energy antiprotons, especially in view of operation of the LEAR facility at CERN with the upgraded antiproton source AAC (Antiproton Accumulator AA and Antiproton Collector ACOL). The first course in 1986 covered topics related to fundamental symmetries. This book contains the proceedings of the second course which focused on spectroscopy of light and heavy quarks. These proceedings contain both the tutorial lectures and contri­ butions presented by participants during the School. The papers are organized in four sections: The first section includes theoretical reviews. Section II contains experimental reviews and covers the results in meson spectroscopy from DM2, MARK III, GAMS and n-WA76. Section III presents the new meson spectroscopy experiments in pre­ paration at CERN and Fermilab: Crystal Barrel, OBELIX, Jetset and E760. Section IV is dedicated to LEAR and to future facilities where meson spectroscopy would be a principal component of the physics programme. We should like to thank Dr. Alberto Gabriele and the staff of the Ettore Majorana Centre who provided for a smooth running of the School and a very pleasant stay. We are particularly grateful to Mrs. Anne Marie Bugge for her crucial help during the preparation and running of the School and for the editing of these Proceedings.

I Theory.- What's new in the old spectroscopy?.- Exotic states beyond the conventional quark model: mesonic nuclei and interhadron potentials.- Prospects for gluonic hadrons at CERN.- Spin-dependent forces between quarks.- II Experimental Reviews.- Resonances.- Experimental search for gluonic mesons.- Experimental status of J/? decays.- Hadron spectroscopy with GAMS.- The CERN ?-WA76 experiment: Light meson spectroscopy in the central region.- III New Experiments with Antiproton Beams.- The Crystal Barrel experiment (PS197) at LEAR.- Spectroscopy of non-exotic ($$\bar q$$) and exotic (gg,ggg,$$\bar q$$g,$$\bar q$$$$\bar q$$) light mesons with the OBELIX detector at LEAR.- Spectroscopy at LEAR with an internal gas jet target.- Antiproton-proton formation of charmonium states.- IV Lear and Future Facilities for Meson Spectroscopy.- LEAR, past, present and near future.- SLEAR, a high luminosity 10 GeV proton-antiproton storage ring with superconducting magnets.- Physics with medium-energy antiproton beams - SuperLEAR.- e+e? heavy flavour factories based on new ideas.- A ?-charm factory at CERN.- European hadron facility.- Participants.