The flagellar beat frequency of Strigomonas oncopelti was found by cinémicro-photography at temperatures in the range 4 − 45 ° C. The thermal dependence is described by an activation enthalpy (ΔH) of 15·4 kcal./mole and an activation entropy (ΔS) of — i e.u. ΔH is comparable with published data on cilia and glycerol-extracted sperm. Values of ΔS ( — 20 e.u.) deduced from the literature suggest a ratelimiting reaction between ions of like charge although the present value does not support this idea.

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‘Normal’ reactions are those in which the rate constant agrees with the prediction of a simple collision theory of reaction rates (Glasstone et al. 1941, p. 5.)

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