Abstract
A temperature-control unit, recording electrodes, pre-amplifiers, and audio and oscilloscopic equipment for recording insect heart potentials are described. Using this apparatus, the heart potentials from intact male and female house flies, Musca domestica L., were recorded. The pattern was variable in both sexes and consisted of a slow systolic wave with spikes appearing before or super-imposed upon it, or both. The female systolic wave had a greater average output and duration but a lower frequency than the male. Possible significance of the spikes associated with the slow potential is discussed.
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