662 Descendenz und Hybriden. 



(white). Such gametes, paired at random would give plants 

 of the following Constitution and relative frequency: 



9 Red = RR + 2 RF + 2 RD + 2 RW -f 2 FD. 

 3 Flesh-coloured = FF + 2 FW. 

 3 Delila = DD + 2 DW. 

 1 White = WW. 



[It is evident that this hypothesis cannot be applied to cha- 

 racters other than colour, without involving serious difficulties. 

 Suppose, for example, a round-seeded Pea with unconstricted 

 pods, which we may call RS, be crossed with a Pea having 

 wrinkled seeds and constricted pods, which we may call WC, 

 if the gametes of the resulting hybrids behaved in the manner 

 suggested, some of their offspring would be of Constitution RR, 

 having round seeds and no pod-characters at all, others of 

 Constitution CC, having constricted pods and no seed-shape 

 characters at all. The author does not suggest how this diffi- 

 culty should be met.] K. Pearson. 



BlFFEN, R. H., Wheat Breeding. (Proc. Cambridge. Phil. 

 Soc. Vol. XII. Part. 4. p. 279—283.) 



The author gives a preliminary account of a long series 

 of experiments. Numerous characters in Wheats were found 

 to have a Mendelian inheritance. The work of Tschermak 

 and Spillman is in general confirmed and extended. In addition 

 to those already known dominance was found in the following 

 pairs of characters, grey and white chaff, keeled and rounded 

 glumes, hollow and solid stems, rough and smooth leaf-surface, 

 short and long leaves, broad and narrow leaves, long and short 

 grains , red and white grains,, glutenous and starchy grains, 

 late and early ripening, the first-named being dominant in each 

 pair. Several cases of blending in the hybrid generation and 

 some of complex segregation in the second generation were 

 observed. Polish and Rivet gave grains of intermediate length. 

 Lax ear and dense ear gave lax ear as dominant, without the 

 blending seen by Spillman. Attention is called to the fact 

 that some of the Mendelian characters were „constitutional" 

 rather than morphological. The evidence suggested that immu- 

 nity from Rust is a recessive character. w. Bateson. 



BOSELLI, Eva, Contributo allo studio del l'influenza 

 del l'ambiente acqueo sulla f or m a e su IIa s tr u ttura 

 delle piante. (Annali di Botanica. 1904. Vol. I. p. 255 

 —274. Tav. V— VII.) 



Le milieu aqueux cause sur les plantes partiellement ou 

 entierement submergees telles que Jussieua suffruticosa L., 

 Mentha aquatica L., Nasturtlum offlclnale R. Br., Comarum 

 palustre L. et Myriophyllum proserpinaeoldes Gill., les modifi- 

 cations suivantes : 



