ADVERTISEMENT. 



The following list of families of Mammals, with analytical tables, has 

 been prepared by Dr. Theodore Gill, at the request of the Smithsonian 

 Institution, to serve as a basis for the arrangement of the collection of 

 Mammals in the National Museum ; and as frequent applications for such 

 a list have been received by the Institution, it has been thought advisable 

 to publish it for more extended use. In provisionally adopting this 

 system for the purpose mentioned, the Institution, in accordance with its 

 custom, disclaims all responsibility for any of the hypothetical views upon 

 which it may be based. 



JOSEPH HENRY, 

 Secretary, S. I. 



Smithsonian Institution, 



Washington, October, 1872. 



(iii) 



