There will always be some people, the victims of the water-tight compartment theory of life, who will hold that a man cannot be a minister or a missionary if he is anything else. These people believe that if a man becomes an explorer he ceases to be a missionary. To be consistent they ought to believe that when Paul practised as a tent-maker he ceased to be an apostle, or that a bishop becomes a secular person if he attends to his parliamentary duties. It is needless to say that Livingstone held no such impossible conception of the ministry. He never at any time ceased to be a missionary. All his work was regarded by him as sacred, because it was done for the glory of God and the good of humanity. The ends that he pursued till the close of his life were essentially the same that he had sought hitherto--the Kingdom of God and His righteousness. One of the most impressive addresses delivered by Livingstone during this visit, and one which produced the most lasting effect, was to a distinguished University audience in the Senate House at Cambridge. It was a magnificent and irresistible appeal for missionaries. He was amazed that some of our societies had to go abroad to Germany for missionaries because of the lack of the missionary spirit at home. He repudiated the talk about sacrifice. He had made no sacrifice worthy to be mentioned in the same breath as the Great Sacrifice made for mankind by Christ. He closed with this impressive appeal: “I beg to direct your attention to Africa; I know that in a few years I shall be cut off in that country, which is now open: do not let it be shut again! I go back to Africa to try to make an open path for commerce and Christianity; do you carry out the work which I have begun. I leave it with you!” It was by such glowing words as these that he enforced on English audiences his favourite theme that “the end of the geographical feat is the beginning of the missionary enterprise.”