1. Adaptation of tactile receptors in the skin of the frog to excitation by an intermittent jet of air is measured and correlated with certain properties of a series of notched discs used to interrupt the air stream.

2. Adaptation in fifteen cases is found to be described by either one of two empirical formulas,

or

t = -k log f + C, for nine preparations

t = a f-b, for six preparations

where f is the per cent frequency at time t and -k and -b are constants defining the rate of adaptation.

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