Abstract
OF late years there has been a growing tendency towards the belief that matter is present everywhere throughout the universe, as well in interstitial space as in the bodies of the spheres. Yet an older hypothesis is still widely held. The phenomena of light seem to require some substantial medium in space, but this substance has been viewed as specifically distinct from matter, and named ether. Another class of thinkers has devised still another species of substance. This is required to meet the demands of the new gravitation hypothesis; and conusts of excessively minute particles, moving with intense speed, and pressing vigorously on the larger and slower particles of matter. In the past still other species of substance were imagined; heat, electricity, etc., were each ascribed to a specifically distinct substance.
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