VOLUME 60.

1. DALY, REGINALD A.—The Geology of Ascension Island. pp. 1–80. 21 pls. June, 1925. $3.00.

2. BARNETT, S. J., AND BARNETT, L. J. H.—New Researches on the Magnetization of Ferromagnetic Substances by Rotation and the Nature of the Elementary Magnet. pp. 125–216. July, 1925. $1.50.

3. BAXTER, G. P., AND COOPER, W. C., JR.—A Revision of the Atomic Weight of Germanium. II The Analysis of Germanium Tetrabromide. pp. 219–237. October, 1925. $0.75.

4. DANA, L. I.—The Latent Heat of Vaporization of Liquid Oxygen-Nitrogen Mixtures. pp. 241–267. October, 1925. $0.75.

5. PIERCE, GEORGE W.—Piezoelectric Crystal Oscillators Applied to the Precision Measurement of the Velocity of Sound in Air and CO_{2} at High Frequencies. pp. 271–302. October, 1925. $0.75.

6. BRIDGMAN, P. W.—Certain Physical Properties of Single Crystals of Tungsten, Antimony, Bismuth, Tellurium, Cadmium, Zinc, and Tin. pp. 305–383. October, 1925. $2.50, with 7 and 8.

7. BRIDGMAN, P. W.—Various Physical Properties of Rubidium and Caesium and the Resistance of Potassium Under Pressure. pp. 385–421. October, 1925. $2.50, with 6 and 8.

8. BRIDGMAN, P. W.—The Effect of Tension on the Transverse and Longitudinal Resistance of Metals. pp. 423–449. October, 1925. $2.50, with 6 and 7.

9. BOSCHMA, H.—On the Symbiosis or Certain Bermuda Coelenterates and Zooxanthellae. pp. 451–460. October. 1925. $0.50.

10. KENNELLY, A. E., AND SLEPIAN, ARTHUR.—Computation of the Behavior of Electric Filters Under Load. pp. 461–483. October, 1925. $0.75.

11. FRANKLIN, WM. S.—Indeterminism in the Physical World. pp. 485–502. November, 1925. $0.50.

12. YEH, CHI-SUN.—The Effect of Hydrostatic Pressure on the Magnetic Permeability of Iron, Cobalt, and Nickel. pp. 503–535. December, 1925. $0.50.

13. ROEBUCK, J. R.—The Joule-Thomson Effect in Air. pp. 537–596. December 1925. $0.75.

14. RECORDS OF MEETINGS; Biographical Notices; Officers and Committees; List of Fellows and Foreign Honorary Members; Statutes and Standing Votes. etc. pp. 597–710. December, 1925. $0.50.