on to that of their conquerors.

To sum up, there are so many features of natural selection, each of
which must be separately weighed and the whole then balanced, that it is
a matter of extensive inquiry to determine whether a certain war has a
preponderance of eugenic or dysgenic results.

When the quality of the combatants is so high, compared with the rest
of the world, as during the Great War, no conceivable eugenic gains from
the war can offset the losses. It is probably well within the facts to
assume that the period of this war represents a decline in inherent
human quality, greater than in any similar length of time in the
previous history of the world.

Unfortunately, it does not appear that war is becoming much less common
if we consider number of combatants rather than number of wars as times
goes on,[159] and it steadily tends to be more destructive. War, then,
offers one of the greatest problems which the eugenist must face, for a
few months of war may undo all that eugenic reforms can gain in a
generation.

The total abolition of war would, of course, be the ideal, but there is
no possibility of this in the near future. The fighting instinct, it
must be remembered, is one of the most primitive and powerful that the
human mechanism contains. It was evolved in great intensity, to give man
supremacy over his environment--for the great "struggle for existence"
is with the environment, not with members of one's own species. Man long
ago conquered the environment so successfully that he has never since
had to exert himself in physical combat in this direction; but the
fighting instinct remained and could not be baulked without causing
uneasiness. Spurred on by a complex set of psychological and economic
stimuli, man took to fighting his own kind, to a degree that no other
species shows.

Now contrary to what the militarist philosophers affirm, this particular
sort of "struggle for existence" is not a necessity to the further
progressive evolution of the race. On the contrary it more frequently
reverses evolution and makes the race go backward, rather than forward.

The struggle for existence which makes the race progress is principally
that of the species with its environment, not that of some members of
the species with others. If the latter struggle could be supplanted by
the former then racial evolution would go ahead steadily without the
continuous reversals that warfare now gives.

William James saw