CHAPTER XVI

General: Romanes, Darwin and After Darwin, 1892, vol. I, chaps. I-V; Same author, The Scientific Evidences of Organic Evolution; Weismann, Introduction to the Evolution Theory, 1904; Osborn, Alte und Neue Probleme der Phylogenese, _Ergebnisse der Anat. u. Entwickel._, vol. III, 1893; Ziegler, Ueber den derzeitigen Stand der Descendenzlehre in der Zoologie, 1902; Jordan and Kellogg, Evolution and Animal Life, 1907, chaps. I and XIV. Evolutionary Series--Shells: Romanes, _loc. cit._; Hyatt, Transformations of Planorbis at Steinheim, _Proc. Am. Ass. Adv. Sci._, vol. 29, 1880. Horse: Lucas, The Ancestry of the Horse, _McClure's Mag._, Oct., 1900; Huxley, Three Lectures on Evolution, in Amer. Addresses. Embryology--Recapitulation Theory: Marshall, Biolog. Lectures and Addresses, 1897; Vertebrate Embryology, 1892; Haeckel, Evolution of Man, 1892. Primitive Man: Osborn, Discovery of a Supposed Primitive Race of Men in Nebraska, _Century Mag._, Jan., 1907; Haeckel, The Last Link, 1898. Huxley, Man's Place in Nature, collected essays, 1900; published in many forms. Romanes, Mental Evolution in Man and Animals.