THREE DISTINCT STRAINS 



The plant on the left represents a tall and early-maturing strain of timothy produced at 

 Svalof; the one in the center is medium-sized and moderately early; and the one on the 

 right is medium-sized and very late. (Fig. 5.) 



whereas other forms growing close by 

 may be left nearly intact. The prac- 

 tical importance of this hereditary 

 character should not be overlooked, as 

 severely diseased individuals evidently 

 decrease in yield the following year (see 

 Fig. 4), or occasionally even are killed 

 out by the attacks. There are also other 

 fungous timothy diseases as, for ex- 

 ample, Scolecotrichum graminis, Epi- 



chloe typhina and Dilophia graminis, but 

 the power of resistance against these 

 diseases has as yet not been a subject of 

 investigation. 



Resistance to aridity also displays, 

 variations, some dwarfed forms with 

 reduced transpiration surfaces being 

 more suitable for adaptation to dry con- 

 ditions. 



Specific longevity is no doubt in- 



298 



