306 6- Vererbungslehre. 



gation round the parental types, and the intermediate. Pure monopodial or 

 sympodial plants breed true, but the crossed plants are intermediate, though 

 nearer the sympodial type, and give a series of intermediates in the next 

 generation, the mode of which coincides with the heterozygous form. 



Doncaster (Cambridge). 

 815) Pearson, K. and E. Elderlin (University of London), A Second 

 Study of the Influence of Parental Alcoholism on the Physique 

 and Ability of the offspring. 



(Eugenics Laboratory Memoirs 13. p. 1 — 35. 1910.) 



This paper is a reply to criticisms of the first memoir on the subject 

 (Elderson and Pearson, Eugenics Lab. Memoirs 10; reviewed in this Zentral- 

 blatt, 1910, p. 507, No. 1067). It consists chiefly in an analysis of the data 

 leading to opposite conclusions quoted by various critics, and shows that these 

 data are less trustworthy than those used by the authors in their former paper. 



Doncaster (Cambridge). 



846) Brownlee, J., The Inheritance of Complex Growth Forms, such 

 as stature, on Mendel's Theory. 



(Proceedings of Royal Society of Edinburgh 31,2. p. 251—256. 1911.) 



Mathematical. It is concluded that (1) if the inheritance of stature de- 

 pends upon a Mendelian mechanism, then the distribution of the population 

 as regards height will be that which is actually found, namely a distribution 

 closely represented by the normal curve: (2) There is nothing in the values 

 of the coefficients of inheritance found by Galton and Pearson which cannot 

 be explained on a basis of Mendelian inheritance. 



Doncaster (Cambridge). 



847) Thoday, M. Gr. and D. (Cambridge University), On the Inheritance 

 of the Yellow Tinge in Sweet-pea Colouring. 



(Proc. Cambridge Philosoph. Soc. 16,1. p. 71—84. 1911.) 

 The authors made various crosses between varieties of Sweet-peas, one of 

 which eontained in each case a yellow factor. The results of these crosses 

 in the first generation, and in one of them — a scarlet by a white — in later 

 generations are given. The detailed results are too long for a short summary, 

 but the authors draw the following conclusions from their work. (1) The deep 

 yellow tinge in scarlet, salmon-pink or deep-cream flowers is dependent on 

 three coincident recessive characters. (2) Any one of these factors causes a 

 yellow tinge; two of them tinge the whole flower, the third affects the Standard. 



(3) Microscopical examination shows that one of the factors which tinges the 

 whole flower colours the cell-sap only. The second tinges the sap more 

 faintly and is commonly associated with a few yellow plastids. The factor 

 which chiefly affects the Standard consists in large Clusters of yellow plastids. 



(4) There are thus grades of yellow tinge in sweet-peas, the less tinged being 

 dominant over the more tinged. (5) Unless the yellow plastid-factor is pre- 

 sent, the flower does not „burn" in the sun. (6) Only the forms with both 

 deep tinge in the sap and yellow plastid colour throw deep cream without 

 pale cream, but the relations of the white and cream forms to the pinks are 

 not yet quite clear. (7) The red forms stand to the pinks in the ratio of 

 about 9 : 7. Two factors are thus necessary to produce the intensification of 

 pink into red. Doncaster (Cambridge). 



848) Drinkwater, H., The inheritance of „Thumb-fingerness" in a 

 short-fingered family: A case of Mendelian Inheritance in Man. 



(Mendel Journal 2. p. 34—52. 6 plates. 1911.) 

 Gives an account of a brachydactylous family, with pedigree extending 



