Effect of Climate and Soil upon Agriculture II 
Fig. 10 might be described as artificial accounting with soils 
under a range of effective moisture variations. In contrast with 
artificial accounting an attempt is made in Fig. 11 to illustrate 
what might be called natural accounting. The proportions of 
this figure are correct in so far as the size of farm in this region 
is a function of natural factors. Furthermore, since soil, tem- 
perature, and sunshine are not limiting elements in this scale the 
variations observed can be attributed largely to moisture. 
Using the size of farm as a function of natural factors it is 
possible to illustrate, with a fair degree of accuracy, the effective 
value of such elements as moisture, temperature, and soil. Under 
the head of soil it will be possible to isolate some of the effects 
of topography and texture. 
Lines I, 2, 3, 4, and 5, Fig. 12, serve as indexes to graphs shown 
in Figs. 13 and 14. 
Fic. 12. Key to graphs shown in Figs. 13 and 14. The soil areas indi- 
cated are the ones having the greatest effect upon the trend of the graphs. 
It will be observed that the rate of change in Graph No. 1, Fig. 
13, increases rapidly after passing Range 22 W. Graph No. 2 
indicates the rate at which size of farm changes across northern 
Nebraska. In this graph a rapid increase in the rate of change is 
observed just west of Range 6 W. It is significant to observe 
that both graphs show a rapid rise as soon as mean annual precipi- 
101 
