290 Allgemeines, 



Hurst, C. C, Mendelian Characters in Plants and Animals. 



(p. 114—129) 

 Deals with a wide ränge of characters in a considerable variety 

 of animals and plants. 



Darbishire, A. D., Recent advances in Animal Breeding and 

 their bearing on our knowledge of Heredity. (p. 130 — 137.) 

 The author describes his experiments in crossbreeding mice, 

 and discusses at some lenght the ränge and importance of the Men- 

 delian theory of heredity. 



Davenpopt, C. B., Dominance of characters in Poultry. 

 (p. 138—139.) 



The author concludes that in poultry dominance of a character 

 in hybridisation is usually determined by the same causes as deter- 

 mine the appearance in the race of a progressive Variation. 

 Yule, G. U., On the Theory of Inheritance of Quantitative 

 Compound Characters on the Basis of Mendel's laws — A 

 preliminary note. (p. 140—142.) 

 The author finds that there is no difificulty in accounting for a 

 correlation coefficient of 0.5 between parent and offspring on the 

 theory of segregation, but that such a value probably indicates an 

 absence of the somatic phenomenon of dominance. 

 Saunders, Miss E. R., Certain complications arising in the 

 crossbreeding of Stocks [Matthiola incann.) (p. 143—149.) 

 The following results of breeding together glabrous strains are 

 recorded: 1. Glabrous sap-colour X glabrous sap-colour gives Fl all 

 glabrous sap-coloured breeding true. 



2. Glabrous sap-colour X glabrous non-sap-colour (i. e, white or 

 Cream) gives Fl all hoary sap. F2 9 hoary sap., 3 glabrous sap., 

 4 glabrous non-sap. 



3. Glabrous white X glabrous cream gives Fl all hoary sap. 

 F2 9 hoary sap., 7 glabrous non-sap-coloured. 



The explanation of these phenomena is that hoariness can only 

 make its appearance when the "factor" for sap-colour is also present 

 in the Zygote. 



Camus, E. G., A Contribution to the Study of Spontaneous 

 Hybrids in the European Flora, (p. 150 — 154.) 



Includes general observations upon the places and conditions 

 fävourable to the production of hybrids in nature, together with 

 special observations upon a number of different families. 

 Macfarlane, J. M., On the Occurrence of Natural Hybrids 

 in the Genus Sarracenia. (p. 155 — 158.) 



The evidence shows that 5. Purpuren . S. flava, S. minor, S. 

 psittacina and 5. Driimmondii all hybridise more or less perfectly 

 in the wild State, and that even second hj^brids are not extremely 

 rare. All of the hybrids seem to originate where masses of two 

 parents are growing together, or in close proximity. 

 Lynch, R. L, Natural Hybrids. (p. 159—177.) 



A list of naturally occuring hybrids taken from the floras of 

 Britain and the Continent of Europe. 

 Wilson, J. H., Infertile Hybrids. (p. 183—209.) 



Describes a number of new hybrids with reference to peculia- 

 rities of their structure and their behaviour under experiment, their 

 infertility being the chief reason why they were chosen for study. 

 Examples are taken from the genera Digitalis, Passiflora, Begonia, 

 Pelargo^iimn , Centaiirea , Brassica, Ribes, Riibtts. 



