SEMINAR      Wednesday, 25 May 2005 - h. 16:00  Auditorium B. Touschek     J. Comfort (Arizona U.) Physics with the Crystal Ball Abstract     In a set of experiments carried out at the Brookhaven National Laboratory, the SLAC Crystal Ball detector is providing new insights into the properties of the excited states of nucleons, meson production mechanisms, and decay modes of eta mesons.    Some topics of considerable interest include isospin symmetries in the pion-nucleon interaction, and the physics of two-pion production. Tests of fundamental symmetries such as P and CP are being examined from the copious production of eta mesons and their decay modes.    Continuing and possible future research with the Crystal Ball will be discussed briefly.