GREELEY, COLORADO. 63 



7. Theory of Natural Selection; Evidences and Criticism: 

 Romanes, Darwin and After Darwin, chaps. 7 and 9, pp. 

 251-378. 



8. An Inherent Error in the Views of Galton and Weis- 

 mann on Variation: W. K. Brooks, Science, vol. I, pp. 

 121-12G. 



9. The Inadequacy of Natural Selection: H. Spencer, Pop. 

 Sci. Mon., vol. XLIII, pp. 21-29 and 162-173. 



10. Mimicry: Jordan and Kellogg, Evolution and Animal 

 Life, chap. 19, pp. 398-425. 



11. Natural Selection: Conn, The Method of Evolution, 

 chap. 3, pp. 51-100. 



12. Natural Selection and the Struggle for Existence: Jor- 

 dan and Kellogg, Evolution and Animal Life, chap. 5, 

 pp. 57-70. 



13. Sexual Selection: Jordan and Kellogg, chap. 6, pp. 71-79. 



14. Artificial Selection: Jordan and Kellogg, chap. 6, pp. 

 80-107. 



15. Organic Selection: Conn, The Method of Evolution, pp. 

 303-320. 



16. Artificial Selection: Plumb, Types and Breeds of Farm 

 Animals, pp. 1-553. 



17. Artificial Selection: Davenport, Principles of Breeding, 

 chaps. 16-20, pp. 577-676. 



18. The Selection Theory: Weismann, Darwin and Modern 

 Science, chap. 3, pp. 18-65. 



19. The Value of Color in the Struggle for Life: Poulton, 

 Darwin and Modern Science, chap. 15, pp. 271-297. 



VARIATIONS AND MUTATIONS: 



1. Discontinuous Variation and Origin of Species: D. T. 

 MacDougal, Science, vol. XXI, pp. 540-543. 



2. Modification and Variation: C. L. Morgan, Science, vol. 

 4. pp. 733-740. 



