Contents

10 August 1973
Vol 181, Issue 4099

About The Cover

Premature maternal deprivation affects many aspects of development in young rats. Some of these effects are reduced or prevented by rearing them in the presence of another adult male or female. A vasectomy procedure was developed for the adult males in order to prevent a second pregnacy in the mothers. See page 554. [Drawings by Bruce Stuart, Kirkwood, Illinois 61447]