"All corpuscules, no matter how great the subdivision may be, remain an unalterable sphere in shape. Their rotating envelopes are composed of tenuous matter, representing the high etheric in its order, having an affinity for the luminiferous condition. When dispersed by sympathetic vibration, they seek the luminous one, with the velocity of gravity, which is its tenuous coincident." [COMMENTS OF JOHN WORRELL KEELY ON DR SCHIMMELS LECTURE]

See Also

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Light
Luminiferous Ether
Luminiferous Ether - Maxwell
luminiferous track
7B.09 - Luminiferous Ether or Light