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Six cats were used to study postmortem changes in resistivity with 60 Hz currents. The resistivity was measured at 1, 3, and 5 hours and at 1, 2, 3, and 4 days for nerve, spinal cord, muscle and adipose tissue, and compared to measurements made in vivo. In the first hour the resistivity increased rapidly, followed by a slower increase to 5 hours. Temperature changes in muscle are correlated with resistivity changes. Decreasing temperature causes a linear increase in resistivity. In vivo resistivity measurements were also made in hogs, dogs, rabbits, rhesus monkeys and rats.