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Cicada's heart action potentials were studied by both surface and intracellularelectrodes. 1) Surface electrograms indicate that the inricate tracingsof the action potentials are due to the presence of alary muscle. After theremoval of alary muscle, the picture became simpler. It was found that thenegative deflection became pronounced at the2nd and the 7th segment. 2) From the results of transverse section, localized cocainization and localizedcooling, it seems reasonable to assume that the cicada's heart has two pacemakers. 3) Intracellular recording from single fibers of cicada's heart showmuscle action potentials of a very simple monophasic form, from which theoscillation of surface potential is concluded to be due to the sum of many othercomponents.

FINDINGS ON THE ELECTROGRAMS OF THE CICADA'S HEART (CRYPTOTYMPAN A JAPONENSIS KATO)