iv PREFACE. 



others, or sunimarics of progress in their respective de- 

 partments, he is permitted to mention the names of Pro- 

 fessoj-s Henry, Giil^ llarkness, Abbe, Xewcomb, Clark, and 

 Ilayden, of Wasliington ; Professors AValil, G. F. Parker, 

 Cope, and Leidy, of Philadelphia ; Dr. Charles Ran, of Xew 

 York ; Dr. A. S. Packard, of Salem ; Professor W. O. 

 Atwater, of Middletown ; Professors Verrill, Marsh, and 

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

 son, of Cambridge ; Professor T. Sterry Ilnnt, of Boston ; 

 Professor Himes, of Carlisle, Pa. ; Dr. Alfred W. Bennett, 

 of London ; and several other collaborators who 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 Hecord^ free 

 access has been allowed by its Secretary to the unrivaled 

 library of publications of learned societies belonging to the 

 Smithsonian Institution. 



The plan adopted in printing the Hecord^ and the mul- 

 tiplicity of subjects sometimes contained in a single article, 

 has prevented a satisfactory systematic arrangement in 

 the body of the work, some paragraphs, indeed, being in- 

 serted by mistake, in the wrong division. By means, how- 

 ever, of the analytical table of Contents, with cross refer- 

 ences, and a copious alphabetical Index, it is hoped that 

 any subject or name can readily be found. 



Spencer F. Baied. 

 Smithsonian Institution, Washington, February 10, 1875. 



