264 Descendenz und Hybriden. 



dominant parent. In the Fa generation the ratios came out 

 2.9 D : 1 R. 



Considering the combination of the two characters the 

 mendelian expectation is four distinct types, the frequency being 

 according to the calculus of chance based upon the mendelian 

 frequencies of 3 round, 1 wrinkled, 3 yellow, 1 green, etc. 

 9:3:3: 1 . The calculated frequencies were 990 : 330 : 330 : 1 10. 

 Those obtained by experiment were 997 : 338:313: 107, and 

 the author concludes that Mendel's hypothesis holds true for 

 the above characters in peas. e. Drabble (London). 



JANCZEWSKI, E. DE, Hybrides des groseillers II (Ribes). 

 (Ext. Bull. Intern. Acad. Sei. Cracovie. Janv. 1904. 10 pp. 

 7 figs.) 



Es werden folgende Ribes- Hy b r i d e neu beschrieben: Ribes 

 Houghtonianum ( — vulgare Lam. X rubrum L.), R. Gonduini (— vulgare 

 Lam. X petraeum Wulfen), R. futurum (= $ vulgare macrocarpum 

 Janczewski X c? Warszewiczii Janczewski), R. Koehnearum (= multi- 

 floruin Kit. X vulgare Lam.), R. Bethmontii (= malvaceum Sm. X ? san- 

 guineum Pursh), R. Spachii (= cereum Dougl. X inebrians Lindl.). Be- 

 sprochen werden: R. pallidum Otto et Dietr. (= petraeum Wulf. X 

 rubrum L.), R. holosericeum Otto et Dietr. (= petraeum Wulf. X rubrum 

 L.), R. urceolatum Tausch (= multiflorum Kit. X petraeum Wulf.), R. 

 Gordonianum Lern. (= sanguineum Pursh X aureum Pursh), R. Schnei- 

 den Maurer (= grossularia L. X nigrum L.), R. intermedium Carriere 

 (= o albidum Part. X cT nigrum L.). Ginzberger (Wien). 



Lyon, FLORENCE, The Evolution of The Sex Organs of 

 Plants. (Botanical Gazette. XXXVII. p. 280—293.) 



The writer from the examination of a number of monstro- 

 sities illustrative of plasticity in the reproduetive tissues of 

 Pterldophytes is led to certain suggestions as to the morpho- 

 logy of archegonia and antheridia, which are on the whole in 

 aecord with those advanced by Davis and Holferty, and 

 reviewed above. She suggests that stalked and embedded 

 archegonia and antheridia as iilustrated by the various groups 

 of Pteridophyta and Bvyophyta have originated from a common 

 gametogenous Iayer possessed by a hypothetical extinet and 

 ancestral group of Chlorophyceae by a process of septation and 

 sterilization comparable to that suggested by Bower for the 

 sporogenous tissues. E. C. Jeffrey. 



PEARSON, Karl, On a Criterion which may serve to test 

 various Theories of Inheritance. (Proc. Royal Soc. 

 London. Vol. LXXIII. No. 493. May 1904.) 



The author finds a criterion for the correetness of the three 

 prineipal theories of inheritance in the nature of the curve of 

 variability of arrays of offspring plotted to parental character. 



The theories in question are: I. the Law of Ancestral Here- 

 dity formulated by Francis Galton, and extended and modi- 



