  NA44 uses a 512 channel Si pad array covering $1.5 <\eta < 3.3$ to study
charged hadron production in 158 A GeV Pb+Pb collisions at the CERN SPS. We
apply a multiresolution analysis, based on a Discrete Wavelet Transformation,
to probe the texture of particle distributions event-by-event, allowing
simultaneous localization of features in space and scale. Scanning a broad
range of multiplicities, we search for signals of clustering and of critical
behavior in the power spectra of local density fluctuations. The data are
compared with detailed simulations of detector responce, using heavy ion event
generators, and with a reference sample created via event mixing. An upper
limit is set on the probability and magnitude of dynamical fluctuations.
