CONTENTS. V 



Page 

 XXV. 1. A Si/nopsis of the Mexican and Central American Species 

 of Salvia. 



2. A Revision of the Mexican and Central American Solanums 



of the Subsection Torvaria. 



3. Some undescribed Mexican Phanerogams, chiefly Labiatae and 



Solanaceae. By M. L. Feknald 487 



XXVI. On the Singular Transformations of Groups Generated hy In- 

 finitesimal Transformations. By Henry Taber .... 575 



Proceedings 601 



A Table of Atomic Weights. By Theodore William Richards . 621 



liEroRT OF the Council 623 



Biographical Notices . 625 



Epes Sargent Dixwell 625 



John Cummings 628 



John Codman Kopes 029 



John Lowell 634 



Officers and Committees for 1899-1900 643 



List of the Fellows and Foreign Honorary Members . . . 644 



Statutes and Standing Votes 653 



Index 665 



