292 Varietäten, Descendenz, Hybriden. 



menkreise (p. 130—131), 6. Vererbung von Anomalien (p. 131 — 132), 



7. Einwirkung äusserer Einflüsse auf die Vererbung (p. 132 — 138), 



8. Mutation (p. 138—141), 9. Knospenvariation (p. 141 — 142). 10. Se- 

 lektion (p. 142 — 145), 11. Bastardierung (p. 145 — 157). Hierunter fin- 

 den sich die Unterabteilungen: a) Allgemeines über Mendelismus, 

 b) Presence und absence Hypothese, c) Gametic coupling, d) Aeus- 

 sere Merkmale und Erbeinheiten, e) Bastardierungen mit Gefüllt- 

 blühenden Sippen, f) Bastardierungsuntersuchungen von Farben- 

 rassen, g) Verschiedene mendelnde Eigenschaften), h) Zwillingsbas- 

 tarde, unter anderem Oenotherenhybriden, i) Bastardierung und 

 Arten. 12. Kern Verhältnisse und Vererbung (p. 157 — 158), 13. Inzucht 

 und Sterilität (p. 158—159), 14. Buntblättrige Sippen (p. 159-161), 

 15. Geschlechtsbestimmung (p. 161 — 164), 16. Pfropfbastarde (p. 

 164—167). G. Tischler (Heidelberg). 



Salaman, R. N., The Inheritance of Colour and other 

 Characters in the Potato. (Journ. Genetics. 1 p. 7—46, with 

 29 pl. (1 coloured). 1910.) 



An extensive memoir on inheritance in domestic and other varie- 

 ties of the Potato. In the domestic varieties, the twist of leaf, as 

 seen in "Red Fir Apple", is a recessive character; length of the 

 tuber is dominant to roundness, deep eyes are dominant to shallow 

 eyes, purple colour in the tubers is dominant to red, and red is 

 dominant to white, but is dependent on the presence of two factors 

 in addition to the chromogen. 



Sterility of the male organs, due to contabescence of the anthers, 

 is a common phenomenon and the condition is distinctly dominant. 

 No plant having pale heliotrope flowers had other than sterile and 

 contabescent anthers. 



Solanum etuberosum exhibits peculiarities which are of great 

 interest. For twenty years, during which it was kept under Obser- 

 vation, it remained completely sterile. In 1906 some seed was obtai- 

 ned both by Dr. Salaman and by Mr. Sutton, and in the following 

 year again fertile seed was obtained by both investigators. During 

 the period of its sterility the parent plant had become noted for its 

 immunity to the attacks of Phytophthora infestans , but a large Pro- 

 portion of the seedlings to which it gave rise were attacked by the 

 fungus. The proportions in which immune and susceptible seedlings 

 occurred suggest that the immunity is a recessive character; if this 

 should prove to be the case, it is of interest that the heterozygous 

 plant remained immune as long as it was sterile. 



Solanum etüberosum presents a further point of interest in that 

 it differs from the domestic varieties in regard to the dominance of 

 certain characters. Thus, in this species, the round shape of the 

 tuber is dominant to the long form, the shallow e5 r e is dominant to 

 the deep eye, and white is dominant to the dark purple colour of 

 the tuber — in each case exactly the reverse of what is found to be 

 the case in the domestic varieties. R. P. Gregory. 



Saunders, E. R., On Inheritance ofa Mutation in the com- 

 mon Foxglove {Digitalis purpurea). (New Phytologist, X. p. 47 — 

 63, with 1 pl. and 12 text-figures. 1911.) 



The Foxglove is well known for the frequency with which aber- 

 rant or monstrous forms occur. One of the monstrous forms, called 



