New York, Jan. 12. - John H. Leonie, otherwise known as John Mosler, w'as arrested for making a "book" on the races while in the corridor of the general postoffice. The pólice magistrate before whom he was arraigned said he had no jurisdiction because the offense was committed on United States territory. Then Leonie, alias Mosler, was brought before United States Commissioner Alexander. The latter said that there being no federa) statute against bookmaking he could not hold the prisoner.