12 Russell R. Spafford 
tation drops below 24 inches. If it were not for sand hills be- 
tween Range 46 W and 6 W in northern Nebraska, Graph No. 2 
would probably follow parallel to and 50 to 100 acres above 
ACRES PER FARM 
30W 
Fic. 13. Graphs illustrating the rate at which size of farm changes along 
east and west lines in Nebraska. (See Fig. 12, lines 1 and 2.) 
Graph No. 1. Any effect due to lower temperature must lie 
within this narrow margin. From these observations it would 
seem that though temperature in this state has an important effect 
upon certain farm enterprises, it has but comparatively little effect 
upon farming as a whole. : 
Graphs along north and south lines in the state (Fig. 14) will 
serve as a partial check on conclusions drawn from a study of 
variation along east and west lines. 
Graph No. 3 across eastern Nebraska lies well east of the line 
of critical moisture. But for the effect of extremely level land 
reducing the size of farm near T 8 N, and for the effect of rolling 
land together with slightly sandier soil increasing the size of 
farm near T 24 N, there is little fluctuation. Judging from these 
measurements topography has at least as important an effect upon 
size of farm as temperature. 
Graph No. 4 is typical of central Nebraska. A slight decrease 
102 
