  Slime mould Physarum polycephalum is a single cell visible by unaided eye.
Let the slime mould span two electrodes with a single protoplasmic tube: if the
tube is heated to approximately 40{\deg}C, the electrical resistance of the
protoplasmic tube increases from 3 M{\Omega} to approximatively 10'000
M{\Omega}. The organism's resistance is not proportional nor correlated to the
temperature of its environment. Slime mould can therefore not be considered as
a thermistor but rather as a thermic switch. We employ the P. polycephalum
thermic switch to prototype hybrid electrical analog summator, NAND gates, and
cascade the gates into Flip-Flop latch. Computing operations performed on this
bio-hybrid computing circuitry feature high repeatability, reproducibility and
comparably low propagation delays
