184 Varietäten, Descendenz, Hybriden. 



Bou-vier, E. L., La variabilite des etres et l'evolution. 

 (Rev. gener. Sc. pures et appliq. XXIII. p. 653-656, 690— 695. 1912.) 



Expose des mutations et de l'evolution de Crevettes d'eau douce 

 de la famllle des Atyides et critique des hypotheses relatives ä un 

 croisement anterieur entre Ortmanma Alluatidi et Atya serrata. 



L. Blaringhem. 



Bruce, A. B., Sur l'heredite des caracteres quantitatifs- 

 (Rapport IVieme Conf. int. Genet. p. 96—98. 1913.) 



L'auteur Signale les difficultes que presente Tetude de l'heredite 

 des caracteres quantitifs; on ne peut affirmer avec certitude que les 

 lois de Mendel soient applicables. En etudiant une famille de plus 

 de 20.000 individus d'Orges, derive d'une croisement unique, la 

 segregation, si eile existe, a ete masquee par la variabilite fluctu- 

 ante des caracteres en jeu. II y aurait un grand interet ä etudier ä 

 ce point de vue les resultats de l'autofecondation repetee ou du 

 croisement systematique en ce qui concerne la vigueur des plantes; 

 il ne parait pas impossible de faire concorder les resultats avec la 

 theorie mendelienne d'une part et avec les regles biometriques de 

 transmission des tendances de Pearson, d'autre part. 



L. Blaringhem. 



Compton, R. H., Further Notes on Epilohimn Hybrid s. 

 (Journ. ßotany. LI. W 603. pp. 79-85. 1913.) 



The author makes a second communication (see Bot. Centralbl. 

 Bd. 119, p. 184, 1912) with regard to artificially produced interspe- 

 cific hybrids in the genus EpUohium. The following are the new 

 first generation hybrids described: 



1) E. hirsutuni Linn. ^ y^ E. inontanwn Linn. ^: remarkable 

 because of the Variation in the form of the shoots and leaves and 

 the associated Variation in the degree of sterility and abortion of 

 the flowers. 2) E. montanuui Linn. (^ \ E. parvißonini Schreb cf : 

 both poUen and ovules are fertile to some extent, but the F, gene- 

 ration has not yet been described. 3) E. hirsutum Linn. J X -S^- 

 parviflovmn Schreb </: this hybrid is pollen-sterile but produces 

 some good ovules. R. H. Compton (Cambridge). 



Gates, R. R., A Contribution to a knowledge ofthe Mu- 

 tating Oenotheras. (Trans. Linn. Soc. Bot. 2nd Series. VIII. 1. 

 p. 1—67. pl. 1—6. 1913.) 



In this paper the author gives a comprehensive account of his 

 experimental researches in the genetical and evolutionär}' aspects 

 of the § Onagra of the genus Oenothera. Parts of the paper summa- 

 rise his previous publications on the history of the O. Lamarckiana 

 forms, the new progressive mutant O. ruhricalyx , etc., but there is 

 included a great number of new observations on the behaviour of 

 the different races, mutants and hybrids. The ontogenetic Variation 

 in leaf-form is given of various h3'^brids, and it is concluded that 

 four types of hybrid behaviour exist: 1) crosses of O. Lamarckiana 

 with its mutants, except 0. gigas, in which both parental forms 

 appear in F^ and usually breed true in later generation; 2) crosses 

 of O. gigas with various forms, giving somewhat confiicting results 

 which appear to be connected with chromosome distribution; 



