Anatomie. — Varietäten etc. 83 



etre extremement faible; ce parenchyme sert plulöt comme endroit 

 d'emmagasinement transitoire, en vue d'une utilisation ac- 

 tuelle ou ulterieure. Les rayons medullaires sont des voies de dis- 

 tribution transversale et locale. E. C. Teodoresco, 



Bailey, P. G., Primary and Secondary reduplication 

 series. (Journ. of Genetics. III. p. 221—227. 1914.) 



In a recent paper, Trow (Journ. of Genetics 1912) discusses 

 theoretically the possible interactions of the factors making up a 

 three factor group of such a nature that any two may form a 

 reduplicated series. 



He Shows that if the factors (1, m, and n) of such a group have 

 a primary reduplication series. of the form (1 : i : i : 1) then the se- 

 condary or observed reduplication series will be of the form 



Imn -[- 1 : m -f- n : m -|- n : Imn -|- 1. 



In the present-paper this is referred to as Trow's general 

 hypothesis: the case where n r:= i as Trow's special hypothesis. 



The author studies the available data by means of the general 

 hypothesis, while other writers have hitherto used the special hy- 

 pothesis. 



It is pointed out that the general hypothesis, admitting the pos- 

 sibility of a difference between the fundamental and primary series 

 due to interaction of the reduplication series one upon the other, 

 does not, as does the special hypothesis, postulate a differential 

 interaction. Further research is required to determine which gives 

 the best picture of segregation. 



An interesting feature is that in all cases the two fundamental 

 series of least intensity have their intensity reduced when they 

 become primary series. W. Neilson Jones. 



Bartlett, H. H., The mutations of Oenothera stenomeres fAmer. 

 Journ. Bot. II. p. 100 — 109. f. 1—4. Feb. 1915.) 



Contains as new names O. stenomeres lasiopetala {0. stenopetala 

 lasiopetala Barth) and O. stenomeres gigas. Trelease. 



Engledo'w, F. L., A case ofreDulsion in Wheat. (Proc. Camb. 

 Phil. Soc. XVII. p. 433—435, 19U). 



The characters with which the author deals are 1. roughness 

 of chaff. 2. black colour of chaff. 



The plants which suplied evidence of repulsion where the Fg 

 generation from a cross 



Smooth Black X Essex Rough Chafi". 



The numbers obtained were: 

 Rough Black 120 : Rough White 43 Smooth Black 47 Smooth White 3. 



If repulsion on 1:3:3.1 basis occurred there would be expected 

 109-8 : 49-9 : 49-9 : 3-3. 



Since the probable error in number of dominants is 43 the 

 agreement is satisfactory. 



Blackness is probably a complex character, since varying 

 degrees of blackness occur among the progeny. Also, black ap- 

 peared in the second generation of a cross in which neither parent 

 showed the black colour. W. Neilson Jones. 



