ADVERTISEMENT 



The present memoir by J. S. Foote, M. D., Professor of Pathology at 

 Creighton Medical College, entitled "A Contribution to the Comparative His- 

 tology of the Femur," records original obser\'ations begun by the author in 1909 

 in a study of cross-sections of the femora of about six hundred different animals, 

 including amphibians, reptiles, birds, mammals, and man, witli a view to deter- 

 mine what variations of lione structure may exist and their signification. 



In accordance with the rule adopted by the Smithsonian Institution, the 

 work has been submitted for examination to a commission consisting of Dr. Ales 

 Hrdlicka, of the United States National Museum; Dr. Frank Baker, of the 

 National Zoological Park; and Dr. George Arthur Piersol, of the University of 

 Pennsylvania, who recommended its publication in tlie present series. 



The work is published in cooperation with the Creighton University, Omaha, 

 Nebraska. 



Charles D. Walcott, 



Secretaiy. 



Smithsonian iNSTrruTiON, 



Washington, December, 1015. 



