CONTENTS. V 



Page 

 XXIII. 1. Occurrence of Native Copper at Franklin Furnace, New 



Jersey. 



2. Exhibition and Preliminary Account of a Collection of 



Microphotographs of Snow Crystals, made by W. A . Bentley. 



By J. E. Wolff 427 



XXIV. An Inquiry into the Nature of Electrical Discharges in Air and 



Gases. By John Trowbridge 433 



XXV. 1. Revision of the Mexican and Central American Species of 



Galium and Relbunium. 

 2. Diagnoses of New and Critical Mexican Phanerogams. 

 By J. M. Greenman 453 



XXVI. Note on the Projective Group. By E. W. Rettger . . . 491 



Proceedings 503 



Report of the Council 517 



Biographical Notices 519 



Benjamin Eddy Getting 519 



Alvan Graham Clark 520 



Alonzo Smith Kimball 524 



List op the Fellows and Foreign Honorary Members . . . 527 



Statutes and Standing Votes 535 



Index 547 



