iv PREFACE. 



delphia ; Professors Newberry, Joy, and Wm. A. Hammond, 

 of New York ; Professors G. F. Barker, Yerrill, Marsh, and 

 Dana, of New Haven ; Professors Agassiz, Gray, and Wat- 

 son, of Cambridge ; Professor T. S terry Hunt, of Boston ; 

 Professor Langley, of Pittsburg ; Professor Himes, of Car- 

 lisle, Pa. ; and Dr. Alfred W. Bennett, of London ; while 

 others prefer to remain unnamed for the present. 



In addition to the large number of scientific serials enu- 

 merated at the end of the volume as received regularly by 

 mail, expressly for service in preparing the Record, free 

 access has been allowed to the unrivaled library of publi- 

 cations of learned societies belonging to the Smithsonian 

 Institution, by permission of its Secretary. 



The plan adopted in printing the Record, and the mul- 

 tiplicity of subjects sometimes contained in a single article, 

 has prevented a satisfactory systematic arrangement. By 

 means, however, of the analytical table of Contents, with 

 cross references, and a copious alphabetical Index, it is 

 hoped that any subject or name can readily be found. 



SrE^CER F. Baird. 

 Smithsonian Institution, Washington, April 10, 1873. 



