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—We are informed, officially, that a general index of the Transactions of the Association from the date of its organization to the present time, embracing the whole series of thirty-three volumes, has been prepared by the Permanent Secretary, and is now in press. It will be ready for distribution at an early day, and all who wish to secure a copy should send one dollar to the Treasurer, Dr. Richard J. Dunglison, P. O. Box 2386, Philadelphia, without delay. With a full index, the value of the past series of volumes will be increased fourfold.