116 Experimental Zoology 
of the other colors. The piebald character stands as a unit con- 
trasted with uniform coat, but is independent of any particular 
color. 
Data jor Other Mammals and Man 
A few other cases in mammals, that seem to show discontinu- 
ous inheritance, are known. Castle and Davenport have both 
called attention to cases of so-called wonder-horses, 7.e. horses 
with remarkably long mane and tail. In the case of “Linus I” 
the mane was 18 feet long and the tail 21 feet. The parents 
and grandparents of these horses also had unusually long hair, 
which increased in successive generations. The data are insuffi- 
cient to show the relation of dominance and recessiveness in this 
case, but the persistence of the long hair seems to indicate its 
dominance." 
Harper and Hurst have recently examined certain data in 
regard to the inheritance of coat color in horses. Harper deals 
with the problem from the standpoint of prepotency of certain 
colors in regard to ancestry, selection, age, and sex. Hurst shows 
that bay and brown colors dominate completely chestnut, and 
there are definite indications that these two colors follow Mendel’s 
law. 
Some statistics recently published (1904) by A. G. Bell have 
furnished Davenport with material to study the relation of black 
color to white color in sheep. The data show that when three 
white individuals having as far as known white ancestors were 
crossed with black sheep, the 13 lambs resulting (F,) were white, 
showing the dominance of white. Of 20 offspring from black 
parents all were black.” When a black (recessive) individual 
was mated with a dominant white (one of whose parents was 
white and one black), 26 lambs were white and 2s black, which 
is the Mendelian expectation. When a dominant-recessive 
white was mated to a dominant-recessive white, 40 were white 
and 7 were black. The expectation is 25 per cent black. The 
In guinea pigs the long hair is recessive. 
? One uncertain case of white is given that is not above suspicion. 
