VARIEGATION 



147 



DR. BAUR ON VARIEGATION. 

 By Dr. George H. Shull. 



in the April number of the Plant World in a very 

 suggestive paper on the nature of certain bud variations Dr. 

 East says that, "it is probable that some at least of the cases 

 of variegation will prove to be pathological." Through the 

 splendid work of Dr. Erwin Baur* so much is already known 

 regarding the nature of variegation that is seems appropriate 

 in this connection to present a brief resume of the results of 

 his studies. 



It is found that there are two fundamentally different 

 kinds of variegation whose external appearance is very sim- 

 ilar, but whose methods of transmission are totally unlike. 

 One type which Dr. Baur calls "infecious chlorosis" is a 

 pathological condition and it is to cases of this kind that 

 he has given most attention. This kind of variegation is not 



Baur, E.. Zur Aetiologie der infektiosen Panacierung. Ber. Deutsch. 

 Bot. Gesell. 22:453-460, 1904. 



tJber die infektiose Clilorose der Malvaceen. Sitzlser. Kgl. Preuss. Akad. 

 Wiss. Jan. 11, 1906, p. 11-29. 



Weitere Mittheilungen f ber die infektiose Clilorose der Malvaceen iind 

 ueber einige analoge Erscheinungen bei liigustrum und Laburnum. Ber. 

 Deutsoh. Bot. Gesells. 24:416-428, 1906. 



Uber infektiose Chloroseti ))ei I^igustrum Laburnum, Fraxinus, Sorbus, 

 Ptelea. Ber. Deutsch. Bot. (Jesells. 25:410-413. 1907. 



T'ntersuchungen ueber die Erbliclikeitsverliaeltnisse einer nur in Bas- 

 tardform lehensfaehigen Sippe von Antirrhinum majus. Ber. Deutsch. Bot. 

 Gesells. 25:442-454, 1907. 



