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The technique of recording electrical activities of single cells by means of intracellular micro-electrodes was first developed by Curtis and Cole (5) and Recently Brock, Coombs and Eccles (4) reported an ingeneous investigation

Recently several papers appeared in succession concerning accommodation of the spinal motoneurons. Working with exponentially increasing currents applied to the toad's spinal motoneurons, ARAKI and OTANI (1959) found that the motoneuron fired from higher depolarization levels when the rate of rise of the stimulating current was reduced. Besides, they found that accommodation was considerably slower in soma-dendritic membrane than in the initial segment of axon. ARAKI (1960) studied further the effect of electrotonus on the accommodative property of the toad's spinal motoneurons. FRANK and FUORTES (1960) have reported on the other hand that accommodation of spinal motoneurons of cats is slow and the threshold current intensity remains constant even when the slope of the current rise is varied within a considerably wide range. Similar results have been obtained also by Komumi, USHIYAMA and BROOKS (1960). The results of the present study which will be described below are partly in agreement, and partly not, with those of just cited studies on cat montoneurons. Essential similarity was found between the present results and those previously reported on toad's motoneurons, but it was noticed that the interpretation given

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