Biologisches Centralblatt 



Unter Mitwirkung von 

 Dr. K. Goebel und Dr. R. Hertwig 



Professor der Botanik Professor der Zoologie 



in Miinchen, 



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 Herreii Mitarbeiter werden ersucht, alle Beitrage aus dem Gesamtgebiete der Botanik 

 an Herrn Prof. Dr. Goebel, Mtinchen, Lnisenstr. 27, Beitrage aus dem Gebiete der Zoolo^ie, 

 vgl. Anatomie and Entwickelangsgeschichte an Herrn Prof. Dr. R. Hertwig, Miinchen, 

 alte Akademie, alle iibrigen an Herrn Prof. Dr. Rosen thai, Erlangen, Physiolog. Institut 



einsenden /u wollen. 



Bd. XXXIII. SO. Marz 1913. J& 3. 



Inhalt: Gates, Tetraploid Mutants and Chromosome Mechanisms (Schluss). - Beard, On the 

 Occurrence of Dextro-rotatory Albumins in Organic Nature. Schneider, Die rechnenden 

 Pferde. Brehm's Tierleben. Ferienkurse. - 



Tetraploid Mutants and Chromosome Mechanisms. 



By R. R. Gates. 



Imperial College of Science, London. 

 (Schluss.) 



In two subsequent papers (1911 b and 1912) Artom has con- 

 tributed further studies on the sexual (2 X) and parthenogenetic 

 (4 X) races of Artemia. He has obtained the parthenogenetic 

 variety from several Italian localities and also from Odessa, while 

 the sexual variety is known from Cagliari and also from Salt 

 Lake, Utah. In the last paper the size-relationships of the Cagliari 

 and Capodistria races are further investigated, and a few of the 

 results may be mentioned. The method used was to measure the 

 area of the drawings of nuclei, treating them as ellipses. In this 

 way the "nuclear area" in the two races was found to be directly 

 proportional to the quantity of chromatin a confirmation of 

 Boveri's law. It is unfortunate that the volume of the nuclei 

 was not determined, so that the results could be directly compared 

 with the law obtained by Gates, Tischler, and others in plant- 

 cells and nuclei. 



The "nuclear area" of the cells of the intestine in the median 

 abdominal region of the metanauplius of the two races was found 

 to be as 1 : 3.7. The cells from the thoracic part of the adult 

 XXXIII. 



