The mean life of positrons was measured in superconducting lead and tin. Consistent results were obtained with the lead sample giving an average value for the mean life of (0.57+/-0.07)×10-9 sec. A null result was obtained with tin; the measured value of the lifetime was (0.15+/-0.09)×10-9 sec, as compared with the room temperature value of 0.15×10-9 sec. The data indicate that the lifetime change in lead is a superconductive phenomenon and not due simply to the low temperature of the sample. Conjectures are made to explain the different results obtained with lead and tin.