252 BIBLIOGRAPHY 



of play, with an important contribution to the theory of 

 sexual selection.] 



GULICK, J. T. "Evolution, Racial and Habitudinal." 1905. 

 [Elaborate discussion of isolation as a factor in evolution.] 



***HAECKEL, ERNST. "Generelle Morphologie." 2 vols., 

 1866. [A classic work, to be placed beside Spencer's 

 "Principles of Biology." It is now out of print, but part 

 of it has been recently re-issued.] 



"Natural History of Creation." English translation, 



1870. [A picturesque book that has passed through 

 many editions. The early chapters give a vivid account 

 of the rise of the evolution theory. The statement of 

 "the evidences" had a deserved success in vindicating 

 the validity of the evolution formula.] 



*HEADLEY, F. W. "Life and Evolution." 1906. [Pictur- 

 esque concrete illustrations of the problems of evolution.] 

 See also "Problems of Evolution." 1900. 



HUTTON, F. W. "Darwinism and Lamarckism." 1899. 



HUXLEY, T. H. Article "Evolution" in "Encyclopaedia 



Britannica," 9th Edition. 

 *** "American Addresses." (1877.) 



JENKINSON, J. W. " Experimental Embry9logy." 1909. [A 

 very able treatise on the external and internal factors in 

 development. With a valuable discussion of Vitalism 

 and Driesch's contributions thereto.] 



**JOHANNSEN, W. " Ueber Erblichkeit in Populationen und 

 in reinen Linien." 1903. [Important experiments on 

 beans, barley, etc.; notably on the isolation of "pure 

 lines."] See also "Die Elemente der exakten ErbLich- 

 keitslehre." 1909. 



JORDAN, D. S., and KELLOGG, V. L. "Evolution and Animal 

 Life." 1907. [Very interesting concrete studies of 

 evolution problems.] 



KELLOGG, V. L. "Darwinism To-day." 1907. [A remark- 

 able book, with the frankest and friendliest reconsidera- 

 tion of Darwinism, in the light of post-Darwinian progress, 

 by a thoroughly competent critic. With abundant 

 references to and quotations from recent evolutionary 

 literature.] 



KROPOTKIN, P. "Mutual Aid a Factor of Evolution." 1902. 

 [A valuable account of the inadequately appreciated 

 "other side" of the struggle for existence.] 



LANKESTER, E. RAY. "The Advancement of Science." 1890. 

 [Important essays on "Degeneration: a chapter in Dar- 

 winism," "A Theory of Heredity," 'The History and 

 Scope of Zoology," etc.] See also "The Kingdom of 

 Man." 1906. 



