Irrespective of the exact historical accuracy of this statement, it is indicative of the process, technically known as 'circular interaction,' which is so essential a step in the development of popular opinion and the building up of crowd sentiment. Before any group of people can become either popular or unpopular there must be a focusing and fixation of public attention upon them. Even in the new Testament we find the Jews sending emissaries from city to city to call attention to the Christian propaganda. Prejudice against the Christians was thus aroused in persons who had never either seen or heard them. The basis of 'circular interaction' is unconscious or subconscious emotional reaction. A's frown brings a frown to the face of B. B's frown in turn intensifies A's. This simple process is the source of all expressions of crowd emotion. By multiplication of numbers and increase in the stimuli employed it is capable of provoking a vicious circle of feeling which eventually causes individuals in a crowd to do things and feel things which no individual in the crowd would do or feel when outside the circle. It is to the credit or discredit of the Jews that they first set this 'vicious circle' in operation against the Christians. Of course the same psychological principle operated to produce zeal and enthusiasm and contempt of pain and death in the Christian 'crowd'. By this process of 'circular interaction' the name, 'Christian,' had already in the time of Justin become a mob shibboleth. It seems to have operated precisely as the shibboleth 'traitor' operates on a patriotic crowd in war time, or 'scab' on a labor group. It became a shibboleth of exactly opposite significance in the Christian 'crowd'. The way was thus prepared for the next step in the process of developing the ultimate crisis. This step--the disparate 'universe of discourse'--is exhibited in process of formation in the account of the martyrdom of Polycarp. The account, as we have it, undoubtedly contains later additions, but these additions even of miraculous elements, do not necessarily invalidate those portions of the story with which we are alone concerned. The martyrologist certainly had no intention of writing his story for the purpose of illustrating the principles of group psychology and the undesigned and incidental statements of crowd reactions are precisely the ones of value for our purpose. A few brief excerpts are sufficient to illustrate the stage reached in the growth of the disparate 'universe of discourse.' "The whole multitude, marvelling at the nobility of mind displayed by the devout and godly race of Christians cried out: "Away with the Atheists: let Polycarp be sought out."[5] He went eagerly forward with all haste and was conducted to the Stadium where the tumult was so great that there was no possibility of being heard."[6]