30 
BF/LLETIX 659, U. S. DEPARTMENT OF AGEICULTUEE. 
farm, this factor is used as a measure of efficiency in ether tabulations 
when size of farm does not enter as a disturbing factor. 
Figure 8 shows gi aphically the relation of size of farm to income 
above rent and percentage returns on the investment. The series of 
vertical lines (bottom of figure) represents the size of farm in crop 
acres, each line representing one farm arranged from left to right 
according to size. The horizontal line at 117.5 acres represents the 
average crop area per farm for all of the farms studied in the survey. 
:: 
mi« 
E 
L 
Fig. S. — Relation of size of farm (bottom) to income above rent (middle) and 
- nt return on invpstment (top) (115 farms. Ellis County. Tex.). 
The series of vertical lines in the middle of the figure represents 
the income of the same farms shown at the bottom of the figure : the 
horizontal line (middle) represents the average income above rent 
for all farms. It is seen that as the size of farm increases (left to 
right) the incomes become larger, i. e.. more of them are above the 
average line than among the farms of smaller >ize. Also, it is ob- 
served that there are more incomes that fall below the zero line as 
