Skin temperatures 24 h after irradiation at both 254 and 300 nm have been examined using the technique of thermography. Increases in skin temperature have been recorded at both wavelengths but the magnitude of these differences after 254 nm irradiation is influenced by the ambient temperature. The apparent disagreement between two groups of observers working in the field of UV erythema may well have been explained.

Measurement of the resting electrical potential difference on the surface of the skin has been made on patients with suspected basal cell carcinoma. It was demonstrated that in fifty-five lesions from fortynine patients, the mean electrical potential difference from thirty-six basal cell carcinomas was found to be + 11 mV, from nineteen benign infiammatory lesions it was found to be +2 mV, and from normal skin, contra-lateral to the lesions in both groups, it was found to be -3 mV. All the measurements are relative to a reference electrode placed under the tongue. The difference between the means for the inflammatory lesions and for the normal skin was found to be statistically insignificant, but the difference between these means and the mean potential difference for the basal cell carcinoma group was found to be highly significant (P

Measurements of the total duration, tA, of the action potential for canine papillary muscle in the temperature range 25-45 degrees C are shown to follow the law ta = tau exp (Q/kBT), with tau and the activation energy Q independent of temperature, T, and kB equal to Boltzmann's constant. The value obtained for Q = 0.65 +/- 0.10 eV. Results are also presented for the temperature dependence of points V(x) on the action potential curve, where x is the percentage of repolarisation within the range 30% less than x less than 100%.

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