CI? 



WEST EAST 



(P 



HALL NO 406 



— rr--^fT 



FOURTH FLOOR. 



The collections upon which this Guide Leaflet is based may be found in 

 the Horse Alcove in the southeastern section of Hall No. 406, the Hall of Fossil 

 Mammals of the Department of Vertebrate Pateontology, on the fourth floor 

 of the Museum Building. In the diagram the star indicates the situation of 

 the Horse Alcove. 



PREFATORY NOTE. 



The collections illustrating the Evolution of the Horse are largely 

 a result of the generosity of the late William C. Whitney, Esq., one 

 of the Trustees of the Museum. The fund provided by Mr. Whitney 

 made it possible for the curator, Professor Henry F. Osbom, to devote 

 a large part of the energies of the department during three years to 

 this subject, and he has given it his especial personal attention, as 

 well. Mr. J. W. Gidley, now of the U. S. National Museum, was placed 

 in charge of the collecting of new material in the western fossil fields, 

 and of special researches in the Museum, and Mr. Adam Hermann 

 of the mounting of the fossil skeletons. The final results of the studies 

 upon the collections by the curator and Mr. Gidley will be issued in 

 a series of monographs. 



The data obtained up to the time of the first publication of this 

 guide (January, 1903) are embodied here, but for the more recent 

 studies readers are referred to the following contributions: 



"Evolution of the Horse," by Henry F. Osbom. Tlic Century 

 Magazine, November, 1904. 



"Evolution of the Horse," by Henry F. Osbom. Columbia Uni- 

 versity Lectures, shortly to be published in book form. 



"Revision of the North American Species of the Genus Equus," 

 by J. W. Gidley. Bull. Am. Miis. Nat. Hist., 1901. 



"New Oligocene Horses," by H. F. Osbom. Bull. Am.Mus.Nat. 

 Hist., 1904. 



And in particular to the series of monographic revisions in prepara- 

 tion by the curator and Mr. Gidley, EniroR. 



