Plate XLVI. Fig. i.—Line of contact between the sagebrush association (right 
hand) and the Kochia association (left hand), showing the char¬ 
acteristically sharp demarcation of the two types. Soil samples 
collected at each side of this line, at points only 20 feet apart, 
showed that in the Kochia land there was ten times as much salt 
in the first foot and seventy-five times as much in the second foot 
as in the sagebrush land. 
Fig. 2.—A typical view of the Kochia association, with plants rather 
far apart, and very uniform in size and appearance. This land 
has been pastured, which has resulted in the removal of practi¬ 
cally all grasses and other species which occur in this association 
when protected from grazing animals. 
Fig. 3.—Plants of Kochia vestita , 4 or 5 inches high, and the grass 
Poa sandbergii, which is usually associated w T ith the Kochia in land 
that is not grazed. 
