The fifth is that the group should have a definite structure, expressed in the specialisation and differentiation of the functions of its constituents. According to McDougall, if these conditions are fulfilled, the psychological disadvantages of the group formation are removed. The collective lowering of intellectual ability is avoided by withdrawing the performance of intellectual tasks from the group and reserving them for individual members of it. It seems to us that the condition which McDougall designates as the 'organisation' of a group can with more justification be described in another way. The problem consists in how to procure for the group precisely those features which were characteristic of the individual and which are extinguished in him by the formation of the group. For the individual, outside the primitive group, possessed his own continuity, his self-consciousness, his traditions and customs, his own particular functions and position, and kept apart from his rivals. Owing to his entry into an 'unorganised' group he had lost this distinctiveness for a time. If we thus recognise that the aim is to equip the group with the attributes of the individual, we shall be reminded of a valuable remark of Trotter's,[20] to the effect that the tendency towards the formation of groups is biologically a continuation of the multicellular character of all the higher organisms. IV SUGGESTION AND LIBIDO We started from the fundamental fact that an individual in a group is subjected through its influence to what is often a profound alteration in his mental activity. His emotions become extraordinarily intensified, while his intellectual ability becomes markedly reduced, both processes being evidently in the direction of an approximation to the other individuals in the group; and this result can only be reached by the removal of those inhibitions upon his instincts which are peculiar to each individual, and by his resigning those expressions of his inclinations which are especially his own. We have heard that these often unwelcome consequences are to some extent at least prevented by a higher 'organisation' of the group; but this does not contradict the fundamental fact of Group Psychology--the two theses as to the intensification of the emotions and the inhibition of the intellect in primitive groups. Our interest is now directed to discovering the psychological explanation of this mental change which is experienced by the individual in a group.