tables on the same space;
not 51 pounds worth of hay, but 100 pounds worth of vegetables of
the plainest description, cabbages and carrots.[1]

[Footnote 1: Kropotkin: _Fields, Factories, and Workshops_, p. 74.]

Of intensive industry the same might be said. Where formerly
a man could produce only enough for one man's consumption,
under conditions of machine production one man's
work can supply quantities sufficient for many. With a
declining birth-rate and the vastly increased productivity of
industry and agriculture, there is a greatly reduced danger of
the population growing beyond their possible sustenance by
the available food supply.

Under certain economic and social conditions there are
marked variations in the birth-rate. This may be due to
various causes which are, by different writers, variously
assigned. The variation of the birth-rate among different
classes is again a matter of common observation and statistical
certainty. Higher standards of living are found regularly
to be correlated with a decrease in the number of children in
a family. An important factor in the voluntary restriction of
population is the desire to give children that are brought
into the world adequate education, environment, and social
opportunity.

CULTURAL CONTINUITY. To the very young the world seems an
unprecedented novelty. It seems scarcely older than their
own memories, which are few and short, and their own experience,
which is necessarily limited and confined. Through
education our experience becomes immeasurably widened; we
can vicariously live through the experiences of other people
through hearing or reading, and can acquire the racial memory
which goes back as far as the records of history, or
anthropological research. As we grow older we come to learn
that our civilization has a history; that our present has a past.
This past extends back through the countless aeons before
man walked upright. The past of human life on earth goes
back itself over nearly half a million years. With this long
past, the present is continuous, being as it were, additional
pages in process of being written.

The physical continuity of the race is insured, as we have
just seen, by a mechanism, which, though it may be subjected
to rational consideration, is instinctive in its operation. The
human beings that people the earth to-day are offspring of
human ancestors reaching back to the appearance of the
human animal in the long process o