On the afternoon of the fifth day of the trial, the Prince of Wales, who had been driven by his royal mother to take the step, much against his will, appeared in court to testify, nominally at his own request, but really from a fear of public opinion. The presiding judge of the Divorce Court, Lord Penzance, when he heard that the Prince desired to testify in his own behalf, exerted himself in such an extreme fashion, as to call down the ridicule and scorn of the London press for his servile proceedings. Having been informed that the Prince was about to appear in court, this flunkey judge, who had been created a peer for something that he had done as a lawyer, was most eager, painfully eager, in fact, to accommodate his Royal Highness. The latter was treated by the judge with a respect which was a combination of profundity, enthusiasm, and excitement. One journal suggested to the learned judge, that while the Prince was in attendance on the trial, it was the duty of the magistrate to have a smoking room fitted up for the special use of the Prince, while another claimed that a billiard table should be provided for the amusement of the Prince between the intervals of the evidence, and asked Lord Penzance to be careful and open court daily at an hour to suit the convenience of the Heir Apparent, who is I believe, a late riser. It is a rule of British law, that the members of the Royal family cannot be called upon to testify in any case, unless of their own free will, and then they are not asked to swear to the evidence which they may give, as their simple affirmation is deemed to be sufficient. The Prince of Wales on this occasion, however, thought it necessary to be sworn, and he testified that he knew Sir Charles and Lady Mordaunt, and that Lady Mordaunt had been an acquaintance of his before his marriage to the Princess of Wales. He also testified that he was fond of riding in hansom cabs, and lastly, he swore that there never had been any improper familiarity or criminal act between himself and Lady Mordaunt. This statement, in open court, was a great relief to the Queen, who it is said, at once upon hearing of it sent for the Prince to come to Buckingham Palace, and on his arrival he was welcomed warmly by his mother. [Sidenote: SIR FREDERICK JOHNSTONE TESTIFIES.]