Vererbung, Variation, Mutation. 95^ 



tities, reacts with and destroys the determiner for pigmentation, causing recessive 

 or albinic white. The dominant white is believed to be derived from the Romano- 

 British cattle, now represented by the „Park Cattle". The two types of white 

 hairs have a rather definite distribution in restricted portions of the animals 

 coats, the dominant white occupying more extensive areas than the recessive 

 white. The füll explanation of individual cases requires also the hypothesis of 

 intra-zygotic inhibitions and reactions between the determiner for pigmentation 

 and the antibody resulting from differences in the concentration and intimacy 

 of these in the zygote. Gates (London). 



231) Sturtevaut, A. H. (Columbia University), A critical examination 

 of recent studies on Colour-inheritance in Horses. In: Journal of 

 Genetics n. 1, S. 41—52; 1912. 



Compares the results obtained by several writers on the subject, and con- 

 cludes that the colours of horses may be arranged in the following order, each 

 epistatic to that which precedes it — chestnut, black, bay or brown, grey, roan^ 

 white. Dun probably comes between bay and grey. 



Doncaster (Cambridge). 



232) Comptou, ß. H. (Cambridge University), A further contributiom 

 to the Study of Right- and Left-handedness. In: Journ. of Genetics 

 n. 1, S. 53—70; 1912. 



Confirms the conclusion previously published by the author, that although in. 

 Barley the ratio of "right-handed" to "left-handed" seedlings is nearly constant 

 from generation to generation, the kind of asymmetry itself is not inherited. In 

 Maize also there is no inheritance of right- or left-handedness; the two condi- 

 tions are here equally frequent. but the seeds of the odd rows on the cob give- 

 an excess of right-handed, those of the even rows an almost equal excess of left- 

 handed plants. The possible causes of this are discussed, but no final conclusion 

 is reached. The relation between right- and left-handedness in the first leaf of 

 the seedling to the position of the parts in the mature plant is considered ia 

 regard to several species. Doncaster (Cambridge). 



233) Carr Saunders, A. M., Pigmentation in relation to Selection 

 and to Anthropometric Characters. In: Biometrika 8, 3 — 4, S. 354 — -384. 



From an examination of the records of some thousands of children in Bir- 

 mingham, it is concluded that pigmentation is not a factor in selection by certain 

 infectious diseases. This result is at variance with that obtained from Glasgow 

 children by Macdonald (Biometrika VIII S. 13); the difference between the two 

 results may be due to the fact that the population of Birmingham is more homo- 

 geneous, Glasgow having a large foreign dement. No significant correlation was 

 found between pigment and height or weight. Doncaster (Cambridge). 



234) Drinkwater, H., Account of a family showing minor brachy- 

 dactyly. In: Journ. Genetics IL 1, S. 21 — 40 (11 photographs) ; 1912. 



In the family here described the brachydactyly is less pronounced than in 

 that described previously by the author. It affects all the fingers and toes, and 

 consists chiefly in the extreme shortness of the middle phalanx of each digit^ 

 especially of the index and fifth fingers. The second phalanx is however not 

 ankylosed to the third; its shortness is largely due to the absence of the epi- 

 physes and to the premature ossification of the cartilage at the end of the pha- 



