documents a direct connection between actin filaments and cytoplasmic movements.The primary data showing movements in cell-free extracts of Amoeba proteus were recorded on 16-mm movie film and shown at the 1968 Annual Meeting of the American Society for Cell Biology (ASCB; Pollard and Ito, 1968).However, no technology was available at the time to include this data in the paper.This addendum includes eight video sequences from those movies.