ABSTRACT
We should all of us have been familiar with the fourth dimension for years if Slade had not turned out a trickster. Slade was an American mediumthe original of Browning’s “ Mr. Sludge ” —who fooled Professor Zöllner by giving him what pur ported to be experimental evidence of the fourth dimension. Zöllner was a distinguished German physicist, Professor of Astronomy in the University of Leipzig, old, near-sighted, pre-disposed to spiritual ism, and unskilled in legerdemain. Any proofs that Zöllner asked for, Slade was usually able at the next
