DAPPLED AND STRIPED HORSES 



91 



The question might now arise — If the striping of the Zebra 

 is only a modification of some sort of ancestral Horse-dappling, 

 why have not the stripings of the Zebra any signs whatever of 

 their component spots or patches ? 



Fig. 55. — Picture of a Donkey in the possession of an Indian washerman. 



Well, why have some Horses no trace whatever of dappling ? 

 Of course the spotting disappeared like many other things that 

 become extinct. This disappearance is one of the great features 

 of evolution. Atrophy first and total suppression later on ; and 



