INTRODUCTION. ix 



Dr. Salensky realized the importance of determining what 

 relationship existed between the wild horse of Mongolia and 

 domestic horses, more especially whether it had '' given origin to 

 any of the ancestors of the domestic horse," but for want of data 

 he was not in a position to deal exhaustively with these problems. 



Since 1902 the young horses imported from Mongolia have 

 reached maturity, and while I have demonstrated that they 



Photo by'i 



[The Duchess op Bedford. 

 Fig. 2. — Young Prjevalsky mare in summer coat. 

 (From Hayes' " Points of the Horse.") 



decidedly differ from mules obtained by crossing a wild Asiatic 

 ass with Mongolian, Exmoor and other ponies, it has been proved, 

 in the Duke of Bedford's herd of wild horses at Woburn, that, 

 unlike zebra and ass mules, they are not only fertile with each 

 other, but, in addition, produce hybrids when crossed with domestic 

 mares. 



Since Dr. Salensky's work on Prjevalsky's horse was published 

 in 1902, evidence has been accumulating in support of the view 



