An Introduction to a Biology 



bred several examples of this new species, but have so far 

 been unable to obtain young from them. 



The reader may suspect that there is something pecu- 

 liar about these two characters albinism and waltzing 

 that the former is one that is likely to have arisen as a sport, 

 and that the latter is, in a way, pathological, and that both 

 are of such a kind as to be very quickly eliminated in the 

 struggle for existence : my opinion is that such a suspicion 

 is of great interest. But I do not propose to discuss the 

 source of such variations here : all I have tried to do is to 

 sketch the relation which exists between Mendelian Prin- 

 ciples and current theories of the origin of species. 



LIST OF AUTHORITIES REFERRED TO IN 

 THE TEXT: 



Together with most of the literature on the subject 

 which has appeared during and since 1902. 



'65. MENDEL, GREGOR. Versuche iiber Pflanzen-Hybriden. 

 Verhandl. d. Naturforsch. Ver. Briinn, Vol. 4, 1865 

 (Abhandlungen). 



'94. BATESON, W. Materials for the Study of Variation. 

 Macmillan, London. 



'96. PICKERING, J. W. Coagulation in Albinos. Journ. 

 PhysioL, Vol. 20, p. 310. 



'97. GALTON, FRANCIS. The average Contribution of each 

 several Ancestor to the total Heritage of the Off- 

 spring. Proc. Roy. Soc., Vol. 61, pp. 401-13. 



'98. WELDON, W. F. R. Presidential Address to Section D, 

 British Assoc., Bristol. B. A. Report, 1898. 



'99. EWART, J. COSSAR. The Penycuik Experiments. A. and 

 C. Black, London. 



:00. DAVENPORT, C. B. .Review of von Guaita's experi- 

 ments in Breeding Mice. Biol. Bulletin, Vol. 2, 

 pp. 121-8. 



:00. PEARSON, KARL. The Grammar of Science. A. and C. 

 Black, London. 



:01. CORRENS, C. Die Ergebnisse der neuesten Bastard- 



