CONTENTS. 



Page. 

 I. Acoustic Impedance and its Measurement. By A. E. Kennelly 



AND K. KXTROKAWA ] 



II. Ghosts and Oculars. By Louis Bell 43 



III. Electrical Resistance under Pressure, Includirig Certain Liquid 



Metals. By P. W. Bridgman . 59 



IV. Motion on a Surface for any Positional Field of Force. By Joseph 



LiPKA 155 



V. Arctic Copepoda in Passamaquoddy Bay. By A. Willey . 183 



VI. The Potential of the Thallium Electrode and the Free Energy 

 of Formation of Thallous Iodide. By Grinnell Jones and 



Walter Cecil Schumb 197 



VII. Anaximander' s Book, the Earliest Known Geographical Treatise. 



By William Arthur Heidel 237 



VIII. Ohservaiions on Army Ants in British Guiana. By William 



Morton Wheeler 289 



IX. The Axes of a Quadratic Vector. By Frank L. Hitchcock 329 



X. The Rumford Fund. By Charles R. Cross 353 



XI. Records of Meetings 375 



Biographical Notices 401 



Officers and Committees for 1921-22 408 



List of Fellows and Foreign Honorary Members 409 



Statutes and Standing Votes 429 



Rumford Premium 445 



Index 446 



