Volume XXI.

I. Notes on the Social Organization and Customs of the Mandan, Hidatsa, and Crow Indians. By Robert H. Lowie. Pp. 1-99. 1917. Price, $1.00.

II. The Tobacco Society of the Crow Indians. By Robert H. Lowie. Pp. 101-200, and 13 text figures. 1920. Price, $1.25.

III. (In preparation.)

Volume XXII.

I. Contributions to the Archaeology of Mammoth Cave and Vicinity, Kentucky. By N. C. Nelson. Pp. 1-73, and 18 text figures. 1917. Price, $.75.

II. Chronology in Florida. By N. C. Nelson. Pp. 75-103, and 7 text figures. 1918. Price, $.25.

III. Archaeology of the Polar Eskimo. By Clark Wissler. Pp. 105-166, 33 text figures, and 1 map. 1918. Price, $.50.

IV. The Trenton Argillite Culture. By Leslie Spier. Pp. 167-226, and 11 text figures. 1918. Price, $.50.

V. (In preparation.)