Furthermore, evolution in human society is still far short of a
state where some and some only are reproductive members of the group while
the others are necessarily sterile; social insects with stable colonies
are so organized that the queens and drones are solely reproductive while
the workers are destined to care for the material wants of the colony. It
is true that the birth-rate is by no means the same in all classes of
society, but the social and other adventitious restrictions that bring
this about are not on the same plane with the hereditary determining
factors which operate among insects. Therefore the scale of human
communities proves to be only a part of the wider range of organic
associations in general--a part which can be definitely placed in such a
wider scheme and so become more intelligible in itself.
In all departments of social evolution, progress is made by the twofold
process of combination and differentiation. We have dealt with detailed
instances, and now it is profitable to treat the process in a larger way,
with a view toward the possibilities of the future. The Thirteen Colonies,
somewhat similar in their earlier economic activities, united for mutual
support much as wolves combine to form a pack.
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