Professor of the natural sciences, world-lecturer, and missionary Henry Drummond was a man of multiple talents and interests. His penetrating scientific mind enabled him to tackle topics such as the way to become like Christ (The Changed Life) and objections to faith (Dealing with Doubt) with clarity and accuracy. The brilliance of these two SEMInal addresses by Drummond demonstrates why his biographer affirmed that “He changed the spiritual climate of his half-century." - The Life of Henry Drummond 1851-1897 by George Adam Smith