Varietäten, Descendenz, Hybriden. 521 



this anomaly are suggested. 1. An injury to the Anlage of the plu- 

 mule. 2. A qualitative change in either the egg or sperm that united 

 to form the fertilized egg which gave rise to the plant due either 

 to exposure of the egg to radium rays, or in either egg or sperm. 

 independent of the radium. 3. Sectional bud-sporting in the Anlage 

 of the plumule due either to the exposure to radium or to sponta- 

 neous causes independent of the radium. 



It is believed that the most plausible presumption is that the 

 radium rays acted as the determining antecedent condition , and 

 that the change induced involved only the cytoplasm ofthesomatic 

 or germ cells concerned (de Vries hypothesis of intercellular pan- 

 genesis). Reference is made to the possibility of enzymatic action 

 being involved in such a change and it is concluded that the appea- 

 rance of a double Onagra with the character of the first and second 

 generations, constitutes a good illustration of the principle that the 

 inheritance of a character and its expression are two entirely dif- 

 ferent things. Moore. 



Gates, R. R., Early histor ico-bo tan ical records of the 

 Oenotheras. (Proc. Iowa Acad. Sei. XVII. p. 85-124. pl. 1-6. 1910.) 



An attempt to trace, as far as possible, the history of the 

 Oenotheras, particularly the large-flowered forms, in eultivation. An 

 effort is also made to recognize the precise characters of the various 

 forms which have been figured or described during the last three 

 centuries. The original, with translations of descriptions, is given. 

 From various citations it is disclosed that a form resembling O. 

 Lamarckiana was the first Oenothera introduced into Europe from 

 Virginia about 1614, and therefore it did not originate in eulti- 

 vation. It is concluded from facts given, that both O. grandiflora 

 and O. Lamarckiana were twice introduced into eultivation, these 

 forms having passed out of eultivation and become naturalized in 

 many localities in England and elsewhere, during the interval of 

 about a Century in the first case and nearly two centuries in the 

 latter between the first and second introduetion. The type of Lin- 

 naeus O. biennis is believed to have been a large-flowered form 

 in the O. Lamarckiana series and may also have included a form 

 in the O. grandiflora series. 



The more or less complete disappearance or the large-flowered 

 forms from eastern North America is explained by the advan- 

 tage that the small-flowered, self-pollinating forms have in setting 

 seed over the large-flowered, open-pollinating species, with the 

 increasing enemies introduced by civilization. Moore. 



Voss, W„ Moderne Pflanzenzüchtung und Darwinismus. 

 (89 pp. 2 Taf. Naturwiss. Verlag, Godesberg-Bonn. 1911.) 



Der Leser soll in die Lage versetzt werden, sich selbst auf 

 Grund von aus der Literatur zusammengestelten Versuchen ein Ur- 

 teil zu bilden über die Richtigkeit der Darwinschen Hypothese über 

 die Formenbildung. Bei Besprechung der Variabilität wird bei der 

 fluktuirenden ein Unterschied zwischen erblichem und nicht erblichem 

 Anteil und zwischen selbst- und fremdbefruchtenden Pflanzen nicht 

 gemacht, was die Beurteilung der Wirkung der Auslese erschwert. 

 Dadurch kömmt es auch, dass Lochow's Ausleseverfahren dem 

 sogenannten Nilsson'schen — richtiger wäre Vilmorin'schen — 



