BEITRAGE ZU EINER GENETISCHEN ANALYSE ZWEIER GODETIA-ARTEN 285 

must therefore be followed in F;. Such a F;-generation, however, has 
not as yet been raised. | 
15) As to flower colour, doubleness of flowers, and heigth of 
plant an analysis was procured. It was shown that the genes in these 
species crosses behaved in exactly the same manner as in the varietal 
crosses. A change of the genes by species crossing cannot, there- 
fore, have taken place in this case. 
16) The case brought forth by Harrison as an example of a gene 
changed by species crossing is explained on a factorial base. 
17) From the fact that in Godetia no difference is seen in the 
behaviour of the genes in the species crosses and in the varietal crosses 
the conclusion is drawn that there-is no principal difference between 
species and variety crosses with regard to the behaviour in F». 
ZITIERTE LITERATUR. 
1. Bateson, W. and PUNNETT, R. C. 1911—12. On the Inter-relations of Genetic 
Factors. Proceed. of the Roy. Soc. B. 84. 
2. BATESON, W., SAUNDERS, E. R. and Punnett, R. C. 1905. Experimental Stu- 
dies in the Physiology of Heredity. Reports to the Evolution Committee. 
Report II. 
3. — 1906. Ibidem. Report III. 
4. — 1908. Ibidem. Report IV. 
5. BATESON, W. and SUTTON, I. 1919. Double Flowers and Sex-Linkage in Be- 
gonia. Journal of Genetics VIII. 
6. Baur, E. - 1910. Vererbungs- und Bastardierungsversuche mit Antirrhinum. 
Zeitschr. ind. Abst. Vererb. III. 
7. — 1911. Einführung in die experimentelle Vererbungslehre. Erste Auflage. 
Berlin. 
8. — 1919. Ibidem. 3. und 4. Auflage. 
9. BLARINGHEM, L. 1911. La notion d’espéce et la disjonction des hybrides 
d’après CHARLES NAUDIN (1852—75). Progr. rei bot. IV. 
10. CORRENS, C. 1903. Über die dominierenden Merkmale der Bastarde. Ber..d. 
D. Bot. Ges. XXI. 
11. — 1909. Vererbungsversuche mit blass(gelb)grünen und buntblättrigen Sippen 
bei Mirabilis Jalapa, Urtica pilulifera und Lunaria annua. Zeitschr. ind. 
Abst. Vererb. ]. 
12. DAHLGREN, K. V. O. 1918. Über einige Kreuzungsversuche mit Chelidonium 
majus L., Polemonium coeruleum L. und Lactuca muralis L. Svensk Bot. 
Tidskrift XII. 
13. Dexter, J. S. 1918. Inheritance in Orthoptera. The Amer. Nat. LII. 
14. East, E. M. 1916. Inheritance in crosses between Nicotiana Langsdorffii und 
Nicotiana alata. Genetics I. 
