HOW CHARACTERS BEHAVE 149 
more characters are involved the groups may, by patience, be 
separated and new races established that will breed pure. The 
greatest difficulty arises in separating for the dominant. char- 
acters, but the test is in the descendants. 
It will be noted too, in this connection, that in these new 
races an absolutely new association of characters is often brought 
Fic. 26. A dark smooth parent and an albino rough parent. Below is their dark 
rough offspring, and at the bottom one of the types that appeared in the grand- 
children (see text), a new type associating the short coat and the white color, 
— After Castle, 1905, Publication 23, Carnegie Institution, Washington, D.C. 
about as when the white color and the smooth coat have been 
brought together from two different sources. In this way new 
races that will breed true may be got out of a mixture whether 
the characters blend or not. 
Very few individuals pure. What has just been said has 
reference to characters and not to individuals. As will be 
seen below, it is a difficult task to find an individual that is 
