270 On the Intermingliny of Human Races. 
ean be highly cultivated mentally. History affords no evi- 
dence that cultivation, or any known causes but physical 
amalgamation, can alter a primitive conformation in the 
slightest degree. Loyele himself acknowledges :—“ The 
separation of the coloured children in the Boston schools 
arose, not from an indulgence in anti-negro feelings, but be- 
cause they find they can in this way bring on both races 
faster. Up to the age of fourteen the black children advance 
as fast as the whites ; but after that age, unless there be an 
admixture of white blood, it becomes in most instances ex- 
tremely difficult to carry them forward. That the half-breeds 
should be intermediate between the two parent stocks, and 
that the coloured should therefore gain in mental capacity 
in proportion as it approximates in physical organization to 
the whites, seems natural; and yet it is a wonderful fact, 
psychologically considered, that we should be able to trace 
the phenomena of hybridity even into the world of intellect 
and reason.” Dark-skinned races, history attests, are only 
fit for military governments. It is the unique rule genial to 
their physical nature. None but the fair-skinned types of 
mankind have been able hitherto to realize, in peaceful prac- 
tice, the old Germanic system described by Tacitus :—* De 
minoribus rebus principes consultant de majoribus omnes ;” 
omnes, be it understood, signifying exclusively white men of 
their own type. 
The races of mankind obey the same organic laws which 
govern other animals; they have their geographical points of 
origin, and are adapted to certain external conditions that 
cannot be changed with impunity. The natives of one zone 
cannot always be transferred to another without deteriorat- 
ing physically and mentally. Races, too, are governed by 
certain psychological influences, which differ among the spe- 
cies of mankind, as instincts vary among the species of lower 
animals. These psychological characteristics form part of 
the great mysteries of human nature. They seem often to 
work in opposition to the physical necessities of races, and 
to drive individuals and nations beyond the confines of human 
reason. Wesee around us, daily, individuals obeying blindly 
their psychological instincts; and one nation reads of the 
