A History of Science — Volume 3 · Henry Smith Williams — chapter 20 of 20 · ~21 words · public domain
THE ETHER AND PONDERABLE MATTER
(1) (p. 297). James Clerk-Maxwell, Philosophical Magazine for January and July, 1860.
END OF VOL. III
A History of Science — Volume 3 · The Wunder Library — complete classics, free to read, with narration.