178 DISEASE IN PLANTS. 



Concerning physiological races and adapted varieties of 

 Puccinia, etc., see Eriksson, " A General View of the Prin- 

 cipal Results of Swedish Research into Grain Rust," Botanical 

 Gazette, vol. 25, 1898, p. 26. 



For an account of Wheat-rust see Marshall Ward, " Illus- 

 trations of the Structure and Life-history of Puccinia 

 graminis, etc.," Ann. of Bot., 1888, Vol. II., p. 215. 



