Investigations performed at the University of Palermo in an attempt to reproduce the “cold fusion” experiment are reported. The search was devoted to detecting neutron emission from palladium electrodes electrolytically charged with deuterium. In no test was neutron emission significantly over the background observed, either in bursts or continuous. Results of a few tests are reported. For the more sensitive test, an upper limit for D(d,n) cold fusion (at 98% confidence level) of λf < 3.6 × 10−24 fusion/s·d-d pair is determined.