Abstract
The process of autogamy that accompanies encystment in Tetrahymena rostrata was divided into five stages; A; first meiotic division, B: second metabolic. C: post-meiotic division and fusion of the pronuclei, D: first and second synkaryon''s mitosis and E: macronuclear-polyploidization. In this communication the kinetics of these phases is reported. The degeneration of the old-macronucleus begins about the second meiotic division (stage-B), and the development of the new-macronucleus progressively rises during about 15 h.

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