¹ From the Physiological Laboratory, Clark University, Worcester

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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