Varietäten, Descendenz. Hybriden. lö/ 



schlagen. Die Verff. zeigen, dass dieser Ausdruck nur Verwirrung 

 bringen könne, da ein Faktor ja oft die verschiedensten Teile eines 

 Tieres oder einer Pflanze beeinflusse. 



Zum Schluss wird darauf hingewiesen, dass die Ausdrücke 

 Regel und Gesetz beständig verwechselt würden, so würde von 

 Mendelschen „Gesetzen" geredet, während es doch nur Regeln 

 seien u. s. w. • G. v. Ubisch (Münster i. W.). 



Trow, A. H., Forms of Reduplication: primär y and se- 

 condary. (Journ. Genet. II. 4. p. 313—324. F. 96. 1913.) 



Attention is drawn to the fact that reduplication series are now 

 known which do not come under the general formula suggested by 

 Bateson and Punnett (J. of Genetics I. 4.) viz: 

 n — 1 : 1 : 1 : n — 1 and 1 : n — 1 : n — 1 : 1 where n is some power of 2. 



The author calculates that given three factors A, B, C and the 

 occurrence of reduplication between A and B in the form n : 1 : l : n 

 and between A and C in the form m : 1 : 1 : m, there will be '•Secon- 

 dary" reduplication between B and C of the form nm-[-l:n + m: 

 n-]-m;nm-|-l and similarly where more factors are involved. 



Other possible types of reduplication series are worked out. 



Experimental illustrations are furnished by Gregory's work 

 on Primula Sinensis and Bateson and Punnett investigations on 

 Lathyrus sp. The author gives diagrams to illustrate the hj'pothe- 

 tical course, of the segregations and cell-divisions in the various 

 cases considered. W. Neilson-Jones. 



Wheldale, H. and H. L. Bassett. The Chemical Interpre- 

 tation of some Mendelian Factors for Flower-Colour. 

 (Proc. Roy. Soc. No. B 595. p. 300—311. Feb. 1914.) 



This paper briefly summarises the genetics of Flower-colour 

 in Antirrhinum and reviews the interpretation suggested by Miss 

 Wheldale in a previous paper. 



Reference is made to an earlier paper (Wheldale and Bassett. 

 Biochem. Journ. 1913 vol. 7, p. 441) in which the ivory pigment in 

 Cream coloured flowers was identified with aspigenin — a flavone 

 of known Constitution. 



In the present paper the yellow pigment extracted from yellow 

 flowered varieties is identified with luteolin — a flavone which 

 differs from aspigenin by the possession of an additional — OH group. 



Tfle ivory and yellow varieties of Antirrhinum show therefore 

 a fundamental difference affecting the production of different hy- 

 droxy-benzoic acids from which the respective flavones maj^ be 

 synthesised. 



It was not found possible to extract flavones from white flowers. 



On the Wheldale and Bassett interpretation, the anthocyanin 

 pigments are regarded as derivatives of the flavones by oxidation 

 or condensation. 



The hypothesis of Keeble Armstrong and Jones (Proc. Roy. 

 Soc. 1913 B. vol. 86 p. 308), to explain the loss of colour when 

 coloured petals are treated with strong alcohol and the subsequent 

 restoration of colour when treated with water, is criticised at 

 some length. 



The Authors hold that the experimental evidence adduced in 

 Support of this hypothesis is capable of other interpretations and 



