Chapter Ix. 1. How Extensive Has the Belief in Evolution Become Since

Darwin's day? 2. How does the theory of Natural Selection fail in accounting for Variation; how did Darwin try to amend his original theory; and what is Weissmann's belief. 3. What second objection has been brought against the theory of Natural Selection, and what have been the contributions of Wagner, Jordan, and Romanes to the discussion? 4. What is the third objection to Darwinism, and what is the bearing upon it of the theory of Orthogenesis? 5. What is the American and French tendency toward the belief that use is the cause of the persisting of organs? 6. How did DeVries discover the principle of mutation, and how does it apply to the discussion of evolution?