Part 16

cut out the disc, and, radiating from the centre thereof, about midway from the margin, cut or stamp thirteen equidistant perforations; each an inch long, and about the sixteenth of an inch wide.

Pin the centre of the disc to a handle and revolve it in the direction of the arrow, at a distance of about twenty-four inches, in front of a mirror.

By looking through the upper series of perforations at the reflection of the lower series of figures, a semblance of the original movements of life will be seen.

The figures may be appropriately colored, and the back of the cardboard disc should be painted a dark color, or covered with a piece of dark surfaced paper before cutting the perforations.

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DESCRIPTIVE ZOOPRAXOGRAPHY.

An Elementary Treatise on Animal Locomotion,

EADWEARD MUYBRIDGE.

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Illustrated with twelve consecutive phases--occurring during a single stride--of each of the six regular progressive movements of the horse, traced from the results of an investigation made by the Author for the University of Pennsylvania.

12 mo. bound in cloth. Price in the United States, One Dollar; in Great Britain Four Shillings and Three Pence.

Sent upon receipt of price, free of postage to any country within the Universal Postal Union.

EADWEARD MUYBRIDGE, University of Pennsylvania, Philadelphia, U. S. A. Or 10 Henrietta Street, Covent Garden, London.