The interest aroused by these Addresses on Christian Apologetics, and more particularly by Lord Kelvin's speech at the first meeting, followed by the controversy in The Times, is, I hope, sufficient justification for their publication in book form, apart from the fact that many foreigners as well as Englishmen have expressed a desire to see them in print. They owe their origin to the Committee of the Christian Association of University College, London, in the Botanical Theatre of which they were delivered during the Summer Term of the Session 1902-8. Intended at first solely for the men-students of our own College, when the scheme was further developed it was determined to throw open the meetings to men and women students from all London Colleges and Hospitals.