Nationalism emerged to agitate the world only after the war, and the first visible phenomenon which this intellectual epidemic of our century brought about was xenophobia; morbid dislike of the foreigner, or at least fear of the foreigner. The world was on the defensive against strangers, everywhere they got short shrift. The humiliations which once had been devised with criminals alone in mind now were imposed upon the traveler, before and during every journey. There had to be photographs from right and left, in profile and full face, one's hair had to be cropped sufficiently to make the ears visible; fingerprints were taken, at first only the thumb but later all ten fingers; furthermore, certificates of health, of vaccination, police certificates of good standing, had to be shown; letters of recommendation were required, invitations to visit a country had to be procured; they asked for the addresses of relatives, for moral and financial guarantees, questionnaires, and forms in triplicate and quadruplicate needed to be filled out,