CONTENTS. 



Page. 



I. The Algae of Bermuda. By F. S. Collins and A. B. Hervey 1 



II. The Genus Fraxinus in New Mexico and Arizona. By Alfred 



Rehder 197 



III. The Australian Ants of the Ponerine Tribe Cerapachyini. By 



W. M. Wheeler 213 



IV. Thermo-electromotive Force, Peltier Heat, and Thomson Heat under 



Pressure. By P. W. Bridgman 267 



V. The Dyadics which occur in a Point Space of Three Dimensions. 



By C. L. E. Moore and H. B. Phillips 387 



VI. Post-glacial History of Boston. By Hervey W. Shimer . . . 439 



VII. Ancient Chinese Paper Money as Described in a Chinese Work on 



Numismatics. By A. McF. Davis 465 



VIII. Rotations on Hyperspace. By C. L. E. Moore 649 



IX. Extra- American Dipterophilous Labotdbeniales . By Roland 



Thaxter 695 



X. Records of Meetings 753 



Biographical Notices 775 



Officers and Committees for 1918-19 877 



List of Fellows and Foreign Honorary Members 879 



Statutes and Standing Votes 897 



RuMFORD Premium 911 



Index 913 



