388 Descendenz und Hybriden. 



Brainerd, E., Hybridism in the genus Viola. II. (Rho- 

 dora. VIII. p. 6—10. January 1906.) 



The generaiization is made that at least as regards the 

 blue acaulescent violets of northeastern America, any two 

 of the currently recognized species that have been growing 

 together for several years are Hkely to present hybrids. Preli- 

 minary to a detailed demonstration, the author here presents 

 a Statement concerning hybridism among European violets, 

 an analysis of the laws relating to known hybrids among 

 flowering plants, and a discussion of the effect of hybridism 

 upon specific definitions. Trelease. 



Darbishire, A. D., On the Bearing of Mendel ian Prin- 

 ciples of Heredity on Current Theories of the 

 Origin of Species. (Mem. and Proc. Manchester Lit. 

 and Phil. Soc. 48. Memoir 24. 19 pp. 1904.) 



This article embodies a brief general account ofMendel's 

 work on Heredity. The author points out the essential dis- 

 agreement between the theories of heredity associated with the 

 names of Mendel and Galton respectively. An illustration 

 is given of the way in which the old difficulty regarding the 

 swamping of new varieties by inter-crossing can be got over 

 if the ideas of discontinuous Variation and Mendelian inheritance 

 are accepted. r. h. Lock. 



Darbishire, A. D., On the supposed Antagonism of 

 Mendelian to Biometrie Theories of Heredity. 

 (Mem. and Proc. Manchester Lit. and Phil. Soc. 49. 

 Memoir 2. 19 pp. 1905.) 



In the words of the author: „It is the thesis of the present 

 essay to demonstrate the compatibiiity of Mendelian biometric 

 theory and to account for their apparent antagonism". 



The line is taken that the observations of mass phenomena 

 by the biometricians and the study of the properties of the 

 germ cells by the mendeiians are of like importance and can 

 be made mutually helpfuil. The difference between them is 

 regarded as depending simply upon the point of view from 

 which the same facts are observed. r. h. Lock. 



Hurst, C. C, Experi mental studies on Heredity in 

 Rabbits. (Linnean Society's Journal. Zoology. Vol. XXIX. 

 1905. p. 283-324.) 



In these experiments Belgian rabbits were crossed with 

 albino Angoras. The existence of four pairs of unit characters 

 was demonstrated, viz. (1) Short and Angora coat, (2) Norma- 

 lity and albinism, (3) Grey and black coat, (4) Self-coiour and 

 Dutch markings. 



