Memory1 1The previously unpublished research described in this paper was supported by United States Public Health Grant MH 07147-07 from the National Institute of Mental Health. Douglas L. Medin was supported in part by United States Public Health Grant GM 16735. Roger T. Davis was supported by National Institute of Mental Health Career Development Award 5-K3-MH-30,885-05. The order of authorship was determined by a coin flip. We are indebted to Keith A. Wollen, Donald Robbins, and Arthur J. Riopelle for their helpful suggestions in reading earlier versions of this manuscript. The research covered in this chapter was completed in the summer of 1971.