Dr. Trueblood addresses himself to the single purpose of replying to the question, raised today even among church people, of whether the ""Christian Mission"" has any justification now. His positive answer to that question was inspired by his own experiences during a world tour in the late months of the past year. Acknowledging that some current criticisms and reservations with respect to the missionary enterprises of religious denominations may be justified, he concerns himself with the more basic issue of whether the idea of mission is itself sound; and he asserts that ""the notion that we can keep the remainder of Christianity with the Mission deleted is one in which there is no validity at all."" As a corollary, the idea that mission may be invalid when carried on abroad, but not when engaged in at home, is also rejected. The development of these premises follows very much the conventional argument to be found in church and missionary circles in recent years. Professor Trueblood's selection of incidents and trends reflects his own observations and conclusions, but do not always seem to be equally cogent to others.