186 Descendenz und Hybriden, 



Bateson, W., Practicalaspects of the NewDiscoveries 

 in Heredity. p. 1 — 9. 



Considers the relation of the Mendelian law to practical 

 plant breeding. Mentions three chief subjects which call for 

 immediate investigation, namely, the resolution of Compound 

 characters and a Statistical study of the components, the nature 

 of dominance and its possible limitations, and finally the detection 

 of differentiation among the gametes of cross-bred organisms. 



Hurst, C. C, Notes on Mendel's Methods of Cross- 

 Breeding. p. 10 — 16. 



Points out that investigators who wish sucessfully to continue 

 MendeTs researches, should select parent plants which possess 

 characters that are at once Single and Constant, and Differential 

 and Dominant, and also must take care to raise large numbers 

 of individuals for many generations. 



DE Vries, H., On Artificial Atavism. p. 17—24. 



Describes the results of some hybrizations of Antirrhinum 

 majiis as to the color of the flowers. Sumarrizes the results 

 as foHows: 1, It is possible to split up the colors of some 

 flowers by crossing the colored type with the white variety: 

 2, The constituents arrived at by this Splitting often follow 

 Mendel's laws : 3, By crossing the appropriate constituents the 

 original Compound color may be rebuilt: 4, Instances of atavism 

 may in this way be artificially produced. 



Leichtun, M., Some Conclusions. p. 25—27. 



Some practical remarks on the technique of artificial 

 pollination. 



Lynch, R. I., Classification of Hybrids. p. 29 — 33. 



Suggests the importance of some consistent Classification 

 for hybrids. Paper also includes report of discussion which 

 followed. 



BURBANK, L., Some of the Fundamental Principles of 

 P lan t B r eeding. p. 35 — 39. 



Speaks of the aims of the plant breeder and the general 

 lines along which he should proceed. 



Orton, W. A., On the Breeding of Disease Resistent 

 Varieties. p. 48—53, PI. 1—4. 



Describes experiments in breeding certain plants which will 

 be resistent to the „wilt diseases". The plants mentioned are, 

 cotton, cow pea {Vigna sinensis), and the watermelon. The 

 fungus concerned was Neocomospora vasinfeda or some variety 

 thereof. Individual plants occur which are found to be resistent 

 to specific diseases and their descendents inherit this tendency. 

 The resistance to one form of disease does not necessarily 

 imply immunity from other diseases. The individuals which are 

 resistent should be bred from, but cross pollination with the 



