Apr., 1922] 
RAINES VEGETATIVE VIGOR OF THE HOST 
203 
the case of wheat and rye. This may be regarded as further evidence, if 
any be required, of the physiological distinction of the ruhigo-vera forms 
growing on wheat and rye on the one hand, and on barley and oats on 
the other. 
Hungerford (1920, p. 270) reports an experiment testing the time of 
first appearance of rust on wheat plants grown from rust-infected and from 
clean seed, similarly indicating that the condition of the seed does not 
affect the time of first appearance of the rust. 
