134 Heredity. 



frequently on the various kinds of dun. They may 

 sometimes plainly be seen on foals and subsequently dis- 

 appear. 



"The dun color and the stripes are strongly transmit- 

 ted when a horse thus characterized is crossed with any 

 other, but I was not able to prove that striped duns are 

 generally produced from the crossing of two distinct 

 breeds, neither of which are duns, although this does 

 sometimes occur. 



" The legs of the ass are often striped, and this may be 

 considered as a reversion to the wild parent form, the 

 Asinus tceniopus of Abyssinia, which is thus striped. 

 In the domestic animal the stripes on the shoulder are 

 occasionally double or forked at the extremity, as in 

 certain zebrine species. There is reason to believe that 

 the foal is frequently more plainly striped on the legs 

 than the adult animal. As with the horse, I have not 

 acquired any distinct evidence that the crossing of differ- 

 ently colored varieties of the ass brings out the stripes. 



"But now let us turn to the result of crossing the 

 horse and ass. Although mules are not nearly so nu- 

 merous in England as asses, I have seen a much greater 

 number with striped legs, and with the stripes far more 

 conspicuous than in either parent form. Such mules are 

 generally light-colored, and might be called fallow-duns. 

 The shoulder stripe in one instance was deeply forked 

 at the extremity, and in another instance was double, 

 though united in the middle. Mr. Martin gives a figure 

 of a Spanish mule with strong zebra-like marks on its 

 legs, and remarks that mules are particularly liable to be 

 thus striped on the legs. In South America, according 

 to Roulin, such stripes are more frequent and conspicu- 

 ous in the mule than in the ass. In the United States, 

 Mr. Gosse, speaking of these animals, says that in a great 



