It was partly in order to advance his church-extension scheme, but more especially to maintain the true theory of a church establishment, and the church’s independence in its union with the state, that he delivered in the Hanover Square Rooms, London, in April and May 1838, that series of lectures on the ’Establishment and Extension of National Churches’ which raised his fame as an orator to its very highest pitch. ’Nothing,’ wrote the late Dr. Begg, who accompanied him, ’could exceed the enthusiasm which prevailed in London. The great city seemed stirred to its very depths.’ At the fourth and fifth lectures, an American clergyman who was present wrote that he found the room densely packed long before the hour, and evidently for the most part by the higher classes. ’Dukes, marquises, earls, viscounts, barons, baronets, bishops, and members of Parliament were to be seen in every direction. After considerable delay and impatient waiting, the great charmer made his entrance, and was welcomed with clappings and shouts of applause that grew more and more intense till the noise became almost deafening.’ ’The concluding lecture,’ says Dr. Hanna, ’was graced by the presence of nine prelates of the Church of England. The tide that had been rising and swelling each successive day now burst all bounds. Carried away by the impassioned utterance of the speaker, long ere the close of some of his finest passages was reached, the voice of the lecturer was drowned in the applause, the audience rising from their seats, waving their hats above their heads, and breaking out into tumultuous approbation.’ An event that somewhat disturbed the line of Dr. Chalmers’s argument for the freedom of the church had taken place just before he left Edinburgh. On the 8th March 1838, the Court of Session, in giving judgment on the famous Auchterarder case, found the veto law of the church to be illegal and _ultra vires_, and began to take steps for the reversal of all that the church had done in connection with it. The judgment had not become final, for it was subject to appeal to the House of Lords, and in his lectures Dr. Chalmers made no reference to it. But when, in 1839, the House of Lords affirmed the decision of the lower court, and when Lords Brougham and Cottenham, in expressing their views, scouted alike the principle of the veto and of the independence of the church (although Lord Brougham had at one time strongly commended the veto), Dr. Chalmers made a full statement of his views in the General Assembly. Before that time he had been disposed to think that if the judgment of the Court of Session should be affirmed by the Lords, the best course for the church would be to give up the veto, reserving power to judge of each case by itself, and act accordingly.