17, 6 
Trelease: Salt Requirements of Wheat Plants 
577 
amount of this salt is increased. Thus in triangle 2, where only 
0.2 of the total concentration is due to potassium chloride, this 
area of injury is confined to the left margin ; it extends somewhat 
more to the right in triangle 7 ; and occupies the left half of the 
diagram in triangles 8 and 9. In the last two cases potassium 
