2i0 PROCEEDINGS OP THE AMERICAN ACADEMY. 



of the tests made, immediate success in obtaining a pure race is assured, 

 whether dominance be alternative or not. But if he selects for puie 

 individuals quite at random, without breeding tests, his chances of suc- 

 cess are considerably greater in a case of alternative dominance than in 

 a case of uniform dominance of one character over the other, as will 

 be clear from an examination of Table V. In the second generation 

 following a cross between a pure A and a pure B, dominance being 

 alternative, the chances are even that any A individual selected at 

 random will breed true ; and when individuals possessing the character 

 J3 have been eliminated for three successive generations, the chances 

 become approximately 94 in 100 that any A individual selected at 

 random will breed true ; whereas, when A uniformly dominates over £, 

 the chances, in the corresponding generations, of securing a pure A are 

 only 1 in 3, and 2 in 3 respectively. 



A graphic presentation of these facts is made in the diagram on 

 p. 239, A', D. 



Bibliography. 

 Bateson, W. 



:02. Mendel's Principles of Heredity, a Defence. With a Translation 

 of Mendel's Original Papers on Hybridisation. xiv + 212 pp. 

 Cambridge. [P^ngland. Contains bibliography and portrait of 

 Mendel.] 

 Bateson, "W., and Sa'anders, E. R. 



-.02. Experimental Studies in the Physiology of Heredity. Reports 

 to the Evolution Committee of the Royal Society. Report I. 

 160 pp. London. 



Castle, "W. E., and Allen, G. M. 



:03. The Heredity of Albinism. Proc. Amer. Acad. Arts and Sci., 

 Vol. 38, pp. 603-622. 



Correns, C. 



:01. G. Mendel's Regeln iiber das Verlialten der Nachkommenschaft 

 der Rassenbastarde. Ber. deutsch. bot. Gesellsch., Bd. 18, 

 pp. 158-168. 



Correns, C. 



:01. Die Ergebnisse der nencsten Bastardforschungeu fiir die Verer- 

 bungslehre. Ber. deutsch. bot. Gesellsch., Bd. 19, Generalver- 

 sammlungsheft, pp. 72-94. 



Correns, C. 



:03. Ueber Bastardirungsversuche mit Mirabilis-Sippen. Erste Mit- 

 theilung. Ber. deutsch. bot. Gesellsch , Bd. 20, pp. 594-608. 



