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Why principally the negative flame returns may be explained in two ways either the point of the flame loses much by radiation, or the base of the flame is a bad conductor. The former explanation would agree with the experiments made by Wiedemann and Ruhlmann, the latter with Erdman's theory of unipolar conductivity of flames.
This theory is still further supported by the resistance on the negative electrodes noticed by Hittorf, which almost explains Erdman's experiments, because if negative electricity enters a flame with greater difficulty, then positive electricity must leave a flame with difficulty. W. Holtz, in Wiedemanris Beiblaetter to Poggendorfs Annalen.
His voice droned away at the bass and ran into the swift high notes of the treble. "Some day I shall play it," he repeated wistfully. Erdman's slow gaze was following the page. "I can't read so fast," he said enviously. Sebastian smiled back. "I know it by heart almost. When the moon was behind the clouds I waited. I sang them over and over."
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