The 1st experiment varied the anticipation interval and the pairpresentation interval during the learning of the A-C list in a B-C, A-B, A-C mediation paradigm. The Russell and Storms (1955) material showed significant amounts of mediated transfer but there was no suggestion of an interaction between mediation and either of the intervals. The 2nd experiment varied stimulus meaningfulness and anticipation interval on the A-D list after learning an A-C, A-B, A-X, or E-X list constructed from the Russell and Storms material. Stimulus meaningfulness, anticipation interval, and lists were effective variables and there was an interaction between lists and stimulus meaningfulness but no interaction between lists and anticipation interval. The results were discussed in terms of an associative probability theory.