Photo 2 (IMAGE) National University of Singapore Caption The frontispiece of the Principles of Geology, volume 1 by Charles Lyell, a book from which Darwin drew inspiration to explain how species change over time. Credit - Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.