Figure 19 : Proportion of P.S. in pontile animals with and without hypothalamic
Ordinate: Percentage of P.S. per 24 h (calculated from continuous Oneirograph
recordings). Abscissa: Time in days. Continuous line: Pontile animals
without hypothalamic island or substitutive therapy. Regular fall in P.S.
and complete disappearance by 7th day (mean of 6 animals). Crosses: Pontile
animal without hypothalamic island. The arrow shows the beginning of substitutive
therapy (postpituitary extract and ACTH). Proportion of P.S. returns to
normal by 15th day (mean of 3 animals). Dotted line: Pontile animal with
hypothalamic island. A relative decrease in P.S. occurs about the 7th
day. The average proportion of P.S. is 10% (mean of 15 animals).