Biologisches Centralblatt 



Unter Mitwirkung von 

 Dr. K. Goebel U nd Dr. R. Hertwig 



Professor der Botanik Professor der Zoologie 



in Mtinchen, 



herausgegeben von 



Dr. J. Rosenthal 



Prof, der Physiologic in Erlangen. 



Der Abonnementspreis fur 12 Hefte betragt 20 Mark jahrlich. 

 Zu beziehen durch alle Buchhandlungen und Postanstalten. 



Die Herren Mitarbeiter werden ersucht, alle Beitrage aus dem Gesamtgebiete der Botanik 

 an Herrn Prof. Dr. Goebel, Mtinchen, Luisenstr. 27, Beitrage aus dem Gebiete der Zoologie, 

 ygl. Anatomic und Entwickelungsgeschichte an Herrn Prof. Dr. R. Hertwig, Mtinclien 

 alte Akademie, alle tibrigen an Herrn Prof. Dr. Roaenthal, Erlangen, Physiolog. Institut 



einsenden zn wollen. 



Bd. XXXII. 20. Juli 1913. J& 7. 



I nh alt: Lutz, Triploid mutants in Oenothera, Swarrzewsky, Zur Chroniidienfrage und Kern- 

 dualismushypothese. Molisch, Die Eisenbakterien. Das Radium in der Biologie und 

 Medizin. Aufruf. X. Ferienkurs. 



Triploid Mutants in Oenothera 1 ). 



By Anne M. Lutz, 



Catholic University of Louvain. Departement of Botany and Cytology. 



In a paper dealing with "The Stature and Chromosomes of 

 Oenothera gigas, De Vries v , published in 1909, Gates, in dis- 

 cussing the possible origin of the 28 -chromosome condition in 

 0. gigas made the following statement: 



"De Vries describes the appearance of a mutation as resulting 

 from the union of a 'mutated' germ cell with an ordinary germ 

 cell. However this view can scarcely apply in this case, since, 

 although it is possible that germ cells may occasionally be produced 

 with the unreduced number of chromosomes, fertilization with such 

 a germ cell would produce an organism with 21 instead of 28 chro- 

 mosomes. The possibilities of two such unreduced germ cells 

 an egg and a sperm - - getting together in fertilization are very 

 remote. Moreover, no instances of this sort are known, and if this 

 were the method of origin one would also expect to find mutants 

 occurring with 21 chromosomes." 



In reply to this statement, Stomps (21) in 1910, pointed out 

 that it is not improbable that 21 -chromosome mutants do occur in 



1) Report of investigations conducted at the Station for Experimental Evolution. 

 Cold Spring Harbor. 



XXXII. 25 



