X Mr. In and Mr. Out are not listed by the census-taker. You will search for them in vain through the social register or the births, marriages and deaths, or the grocer’s credit list. Oblivion has swallowed them and the testimony that they ever existed at all is vague and shadowy and inadmissible in a court of law. Yet I have it upon the best authority that for a brief space Mr. In and Mr. Out lived, breathed, answered to their names and radiated vivid personalities of their own. During the brief span of their lives they walked in their native garments down the great highway of a great nation; were laughed at, sworn at, chased and fled from. Then they passed and were heard of no more. They were already taking form dimly when a taxi-cab with the top open breezed down Broadway in the fain