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 Butler, Samuel, 1835-1902
 Darwin, Charles, 1809-1882
 Huxley, Thomas Henry, 1825-1895
 Lowell, James Russell, 1819-1891
 Seward, Albert Charles, Sir, 1863-1941
 White, Gilbert, 1720-1793
 White, Stewart Edward, 1873-1946


 Biology in the Nineteenth Century
 Cell Theory
 Journal of Reasearches Into the Geology and Natural History of the Various Countries Visited by H. M. S. Beagle, Pp. 554– 559
 Late Nineteenth Century Biology
 Observations on Animalculae
 On the Origin of Species by Means of Natural Selection
 Philosophic Zoologique, Chapter VII
 The Fundamental Law of the Evolution of Organisms
 The General Doctrine of Evolution
 The Library of Original Sources, Vol 10
 The Library of Original Sources, Vol 6
 The Library of Original Sources, Vol 8
 The Library of Original Sources, Vol 9
 The Thought of Thales Summarized by Diogenes Laertius
 Uniformity