88 HISTORY OF PHYTOPATHOLOGY 



taining his theory in the face of withering attacks upon 

 it by the English mycologist, H. Marshall Ward, 1 and 

 by others. He has recently sought to strengthen his 

 position by an extensive study of the hollyhock rust, 

 Pucdnia malvacearum, hi which he assumes to have 

 discovered another marked case of rust inheritance 

 through mycoplasm. 2 Eriksson is the author of a text 

 on the fungous diseases of field crops, the first of a pro- 

 jected series on the fungous diseases of the cultivated 

 plants of Sweden. 3 



Russia's contribution to the ranks of the pathogene- 

 tists was Woronin. He was a mycologist rather than a 

 pathologist. A single contribution, his studies on the 

 club root of cabbage, 4 alone suffices, however, to give 

 him a place among plant pathologists. 



Michael Stepanovitch Woronin was born in St. Peters- 

 burg June 21, 1838, a year after the birth of Hartig. 

 Born of wealthy parents, he was not only well educated 

 but also inherited wealth which made him independent 

 throughout a life almost entirely devoted to investiga- 

 tion. Entering the University of St. Petersburg at the 



1 Ward, H. M.: II. On the histology of Uredo dispersa Erikss. and 

 the "mycoplasm" hypothesis, Phil. Trans. Roy. Soc., London, B: 196 : 

 29-46, 1904. (Read March, 1903.) 



2 Eriksson, J.: Der Malvenrost (Puccinia malvacearum Mont.), 

 seine Verbreitung, Natur und Entwickelungsgeschichte, Kungl. Svenska 

 Vetenskapsakademiens Handlingar, 47 : 2 : 1-125, 1911. 



3 Eriksson, Jacob: Landtbruksvaxternas Svampsjukdomar, pp. 

 I-XII + 1-210, Stockholm, 1910. This is the first part of his Vara 

 Kulturvaxters Svampsjukdomar (Diseases of our cultivated plants). 

 An English translation of this by Anna Molander was published in 1912 

 under the title : Fungoid diseases of agricultural plants. A German 

 translation by A. Y. Greyillius appeared in 1913. 



4 Woronin, M.: Plasmodiophora Brassicae. Urheber der Kohl- 

 pflanzen-Hernie, Jahrb. Wiss. Bot., 11 : 548-574, 1878. 



