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Enchiridion Physicae Restitutae

(See D'Espagnet.) Endless Cord, Tying Knots in: About the years 1877-88 Professor Zöllner of Leipsic investigated the phenomena of the medium Slade, and particularly anything which might prove a fourth dimension of space, in which hypothesis Professor Zöllner was at that time greatly interested. The tying in an endless cord of such knots as could ordinarily only be made if the ends of the cord were free provided such a test. In December, 1877, Zöllner visited Slade with two pieces of hempen cord, the free ends of each England being sealed to a piece of cardboard. To ensure the cord always being in sight Zöllner hung it round his neck, and kept Slade's hands continually in view. Under these circumstances four knots were produced, apparently on the original sealed cord.