The subject of this book may be expressed in three questions: What is evolution? Is it true? What then? Much has been written on each of them, addressed to different classes of minds; some scientific, some to the popular and some to the religious and theological. The author attempts to cover the entire ground and tie all these different parts together. Divided into three parts entitled: What is Evolution; Evidence of the Truth of Evolution; and The Relation of Evolution to Religious Thought.