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The author has found a new age-indicator of a bone in its manganess, which increases remarkably in the course of geological and archaeological time.Points plotted in log. paper in combination with the age presumed archaeologically and the manganese content of bones from several districts of Japan and Korea Formosa (Taiwan) give a smooth curve. And, the content of manganese in bone is especially useful to determine the difference between the recent bone and the old bone.Manganese form less soluble compound in the ordinary natural condition. For this reason, the manganese dissolve in ground water by the almost constant amount. When the manganese ion come into contact with bone, they are absorbed and become locked in bone. Perhaps, this fact brings that the effectiveness of this manganese dating method does not depend on the difference of place from which bone are dug up.In this report, the diagram showing the relation between the manganese content and the age of bones in the range of 2, 000 to 500, 000 years has been prepared.

A Method to Estimate the Relative Age of Bones by Use of Manganese Content