ADVERTISEMENT. 
TuHE 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. L. 
SMITHSONIAN INSTITUTION, 
WasuinetTon, October, 1872. 
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