Suckling physiology and behaviour of rats - an integrated theory of ingestion and satiety, D.N. Lorenz; brain neuronal unit discharge in freely moving animals - methods and application in the study of sleep mechanisms, D. McGinty and J.M. Siegel; sleep-wake states, sucking and nursing patterns in young rats, H.N. Shair and M.A. Hofer; taste, feeding and pleasure, T.R. Scott.