inquiry the influencing of an individual by a large number of people simultaneously, people with whom he is connected by something, though otherwise they may in many respects be strangers to him. Group Psychology is therefore concerned with the individual man as a member of a race, of a nation, of a caste, of a profession, of an institution, or as a component part of a crowd of people who have been organised into a group at some particular time for some definite purpose. When once natural continuity has been severed in this way, it is easy to regard the phenomena that appear under these special conditions as being expressions of a special instinct that is not further reducible, the social instinct ('herd instinct', 'group mind'), which does not come to light in any other situations. But we may perhaps venture to object that it seems difficult to attribute to the factor of number a significance so great as to make it capable by itself of arousing in our mental life a new instinct that is otherwise not brought into play. Our expectation is therefore directed towards two other possibilities: that the social instinct may not be a primitive one and insusceptible of dissection, and that it may be possible to discover the beginnings of its development in a narrower circle, such as that of the family.
Although Group Psychology is only in its infancy, it embraces an immense number of separate issues
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