LEE BARKER WALTON 123 



2. Progressive evolution has resulted from factors aris- 

 ing through cumulations without reference to amphimu- 

 tations (Mendelian combinations) . 



3. Characters once established by cumulations produce 

 by fluctuations, amphimutations, etc., the diversity of 

 organic life. Such secondary variations are only in- 

 directly the products of evolution. 



VI. 



BIBLIOGRAPHY 



Baitsell, G. A. 



'11. Conjugation of Closely Related Individuals of Stylonychia. Proc. Soc. 

 Exper. Biol, and Medicine, pp. 122-123. 



Baitsell, G. A. 



'12. Experiments on the Reproduction of Hypotrichous Infusoria. Journ. 

 Exper. Zool., Vol. 13, pp. 47-76. 



Bumpus, H. C. 



'99. The Elimination of the Unfit as illustrated by the Introduced Sparrow, 

 Passer doniesticus. Biol. Lect., Woods Hole. 



Calkins and Gregory. 



'13. Variations in the Progeny of a Single Exconjugant of Paramecium caudatum. 

 Jourrt. Exper. Zool., Vol. 15, pp. 429-525. 



Casteel and Phillips. 



'03. Comparative Variability of Drones and Workers of the Honey Bee. Biol. 

 Bull., Vol. 6, pp. 18-37. 



Castle, Carpenter, Clark, Mast, and Barrows. 



'06. The Effects of Inbreeding, Cross-Breeding and Selection upon the Fertility 

 and Variability of Drosophila. Proc. Am. Acad. Arts and Sciences, Vol. 

 41, pp. 731-786. 



East, E. M. 



'10. The Role of Hybridization in Plant Breeding. Pop. Set. Monthly, Vol. 

 77, pp. 342-3 5 5. 



East and Hayes. 



'12. Heterozygosis in Evolution and Plant Breeding. Bull. 243, Bureau Plant 

 Industry, U. S. Dept. Agric, pp. 1-5 8. 



Elderton, W. P. 



'07. Frequency Curves and Correlation. London, MacMillan, pp. 1-172. 



Emerson, R. A. 



'10. The Inheritance of Sizes and Shapes in Plants, Am. Nat., Vol. 44, pp. 

 739-746. 



Emerson and East. 



'13. The Inheritance of Quantitative Characters in Maize. Bull. Agr. Exp. 

 Station Nebraska. 



Hatscheck, B. 



'87. Sexual Propagation. Prager medic. Wochenschr., p. 247. 



Hayes, H. K. 



'12. Correlation and Inheritance in Nicotina tabacum. Conn. Agr. Exper. 

 Station Bull. 171, pp. 1-45. 



