a sustaining or frustrating condition.

2. The Social Environment. A being whose activities are
associated with others has a social environment. What he does
and what he can do depend upon the expectations, demands,
approvals, and condemnations of others. A being connected with
other beings cannot perform his own activities without taking the
activities of others into account. For they are the
indispensable conditions of the realization of his tendencies.
When he moves he stirs them and reciprocally. We might as well
try to imagine a business man doing business, buying and selling,
all by himself, as to conceive it possible to define the
activities of an individual in terms of his isolated actions.
The manufacturer moreover is as truly socially guided in his
activities when he is laying plans in the privacy of his own
counting house as when he is buying his raw material or selling
his finished goods. Thinking and feeling that have to do with
action in association with others is as much a social mode of
behavior as is the most overt cooperative or hostile act.

What we have more especially to indicate is how the social medium
nurtures its immature members. There is no great difficulty in
seeing how it shapes the external habits of action. Even dogs
and horses have their actions modified by association with human
beings; they form different habits because human beings are
concerned with what they do. Human beings control animals by
controlling the natural stimuli which influence them; by creating
a certain environment in other words. Food, bits and bridles,
noises, vehicles, are used to direct the ways in which the
natural or instinctive responses of horses occur. By operating