* "Natural Law in the Spiritual World" (1883)* "Tropical Africa" (1888)* "The Greatest Thing in the World and Other Addresses" (1894)* "The Ascent of Man" (1894)* "The Ideal Life and Other Unpublished Addresses" (1897)* "The Monkey That Would Not Kill" (1898)* "The New Evangelism and Other Papers" (1899)== See also ==* God of the gaps== References ==== Further reading ==* Simpson, James Y.
* "Natural Law in the Spiritual World" (1883)* "Tropical Africa" (1888)* "The Greatest Thing in the World and Other Addresses" (1894)* "The Ascent of Man" (1894)* "The Ideal Life and Other Unpublished Addresses" (1897)* "The Monkey That Would Not Kill" (1898)* "The New Evangelism and Other Papers" (1899)* "The Life of Henry Drummond" by George Adam Smith, published in 1898