Pennock,* Dr. Chas. W. Richmond,* Mr. Robt. Ridgway (resigned), 

 Dr. Wm. C. Rives,* Dr. Thos. S. Roberts,* Mr. Jno. H. Sage,* 

 Mr. B. A. Scudder,* Mr. J. D. Sornborger (resigned), Mr. Witmer 

 Stone,* Mr. W. E. C. Todd* and Mr. Francis B. White.* 



Each vohtme was indexed by two persons independently, the re- 

 sults were compared by a third member of the committee and later 

 verified by the editor. An apt quotation discovered by Mr. Wm. 

 Dutcher is a fitting tribute to the voluntary labors of the Index 

 Committee. 



" Y^ labour and y" patience, y^ judgment and y^ penetration 

 which are required to make a good index is only known to those 

 who have gone through with this most necessary and painful but 

 least praised part of a publication." — JVilliam Oldys, 1687. 



The editor, as chairman of the Index Committee, herewith extends 

 grateful acknowledgments to all who have assisted him, especially 

 to Dr. Chas. W. Richmond for the synonymy of foreign species and 

 valuable assistance in proof-reading ; to Dr. A. K. Fisher and Dr. 

 J. A. Allen for proof-reading and for advice ; to Air. Wilfred H. 

 Osgood and Mr. Chas. F. Batchelder for revision and classification 

 of localities ; and to Dr. Walter Faxon for help in editing authors' 

 titles. Mr. Ruthven Deane, Mr. Jno. H. Sage, Dr. Theo. S. Palmer 

 and Dr. xA.. K. Fisher also assisted in obtaining full names of authors, 

 and the arduous labors of the actual indexers is measured by the 

 33,742 cards and sheets in duplicate returned to the editor for 

 verification and classification. 



Jonathan Dwight, Jr., 

 CJiainnan of the Index Committee and Editor. 



New York, November i, 1907. 



