48 BULLETIN OF THE ZOOLOGICAL MUSEUM. 



printed by the Woodbury process ; both negatives, of course, being taken 

 from nature. 



Mr. Jno. Carbutt, of Philadelphia, is the superintendent of the Ameri- 

 can Photo-relief Printing Company (Woodbury process). 



Mr. E. Bierstadt, of New York, is in charge of the Photo-plate 

 Printing Company (Albert process). 



Alexander Agassiz. 

 Cambridge, November 30, 1871. 



