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Heart-beat response: Salk, 1966.<br />
Growth rates: Harrison, Weiner, Tanner and Barnicott, 1964.<br />
Sleep: Kleitman, 1963.<br />
Stages of development: Shirley, 1933.<br />
Development of vocabulary: Smith, 1926.<br />
Chimpdnzee vocal imitations: Hayes, 1952.<br />
Crying, smiling and laughing: Ambrose, ig6o.<br />
Facial expressions in primates: van Hooff, 1962.<br />
Group density in children: Hutt and Vaizey, 1966.<br />
Chapter Four. Exploration<br />
Neophilia and neophobia: Morris, 1964.<br />
Ape picture-making: Morris, 1962.<br />
Infant Picture-making: Kellogg 1955.<br />
Chimpanzee exploratory behaviour: Morris and Morris, 1966.<br />
Isolation during infancy: Harlow, 1958.<br />
Stereotyped behaviour: Morris, 1964 and 1966.<br />
Chapter Five. Aggression<br />
Primate aggression: Morris and Morris, 1966.<br />
Autonomic changes: Cannon, 1929.<br />
Origin o f signals: Morris, 1956 and 1957.<br />
Displacement activities: Tinbergen, tg5i.<br />
Facial expressions: van Hooff, 1962.<br />
Eye-spot signals: Coss, 1965.<br />
Reddening of buttocks: Comfort, 1966.<br />
Redirection of aggression: Bastock, Morris and Moynihan, 1953.<br />
Over-crowding in animals: Calhoun, 1962.<br />
Chaper Six. Feeding<br />
Male association patterns: Tiger, 1967.<br />
Organs o f taste and smell: Wyburn, Pickford and Hirst, 1964.<br />
Cereal diets: Harrison, Weiner, Tanner and Barnicott, 1964.<br />
Chapter Seven. Comfort<br />
Social grooming: van Hooff, 1962. Sparks, 1963. (I am particularly indebted to<br />
,Tan van Hooff for inventing the term `Grooming talk'.) 213