died men in order to win
its cause.

Away from the fighting lines of the contending sides, conditions that
prevail are rendered more severe in many ways than in times of peace.
Poverty becomes rife, and sanitation and medical treatment are commonly
sacrificed under the strain. During a war, that mitigation of the action
of natural selection which is so common now among civilized nations, is
somewhat less effective than in times of peace. The scourge of typhus in
Serbia is a recent and graphic illustration.

After a war has been concluded, certain new agencies of inter-group
selection arise. The result depends largely on whether the vanquished
have had a superior culture brought to them, as in the case of the
Philippines, or whether, on the contrary, certain diseases have been
introduced, as to the natives of the New World by the Spanish conquerors
and explorers, or crushing tribute has been levied, or grievous
oppression such as has befallen Belgium.

Sometimes the conquerors themselves have suffered severely as the result
of excessive spoliation, which has produced vicious idleness and
luxurious indulgence, with the ultimate effect of diminishing the
birth-rate.

Within the nation there may be various results. Sometimes, by the
reduction of overcrowding, natural selection will be less severe. On the
other hand, the loss of that part of the population which is more
economically productive is a very serious loss, leading to excessive
poverty with increased severity in the action of natural selection, of
which some of the Southern States, during the Reconstruction period,
offer a good illustration.

Selection is also rendered more intense by the heavy burden of taxation,
and in the very common depreciation of currency as is now felt in
Russia.

Sexual selection as well as lethal is affected by war in manifold ways.
Considering the armed force, there is an inter-group selection, when the
enemy's women are assaulted by the soldiers. While this has been an
important factor in the past, it is somewhat less common now, with
better army discipline and higher social ideals.

Within the group, mating at the outset of a war is greatly increased by
many hurried marriages. There is also alleged to be sometimes an
increase of illegitimacy in the neighborhood of training camps. In each
of these instances, these matings do not represent as much maturity of
judgment as there would have been in times of peace, and hence give a