The occurrence of jaundice within the first few days of life has, as might be expected, stimulated repeated investigation. The theories advanced to account for this striking phenomenon have been most ingenious, but being based quite as much on speculation as on fact, they have proved unsatisfactory and have been accepted only tentatively in lieu of something sounder. The excuse offered for entering on a path so well trodden is that a new point of vantage of this subject now presents itself, through the use of the duodenal catheter, recently described in quite another connection in the pages of this journal.1 By this means direct access to the bile is afforded at its site of excretion. Before presenting the data gathered by this means, however, it would seem of advantage to sketch in outline the present status of this question.
It is to be noted at the outset that