68 



STUDIES IN THE EVOLUTION OF ANIMALS 



diminishes. The chafing of the collar seems to have the same 

 effect ; but in Fig. 39 and many others the reverse seems to have 

 occurred. Does sex make any difference in the dappling? A 



Fig. 39. — Omnibus Horse with the spots becoming obliterated, leaving a dark-grey surface ; 

 from a photograph by Gabrielli, taken by permission of Mr. Duff, manager of the London 

 Road Car Company. 



great deal is known about the powers of running of the Horse, 

 about his powers of draught, about his anatomy, his physiology, his 

 pedigree, and perhaps about his descent and relation to extinct and 

 living animals ; but very little seems to be known about the origin 

 and course of his dappling. 



