30 DRAINAGE 
a drain will carry water or not; it is useful if it only 
affords ventilation, provided both ends of the drain are 
open. 
The Soils and Crops department of Purdue University 
Experiment station, in their experiments of tiled and un- 
tiled lands, show an average yield of 76.1 bushels of 
corn per acre on tiled land and 61.8 bushels per acre on 
untiled land, or a difference of 14.3 bushels in favor of 
the tiled land. 
This is a money value of $7.15 per acre with corn sell- 
ing at fifty cents per bushel. 
This experiment speaks volumes for drainage and 
shows that a system of good drainage can soon be paid 
for out of the increased yield of crops which it will pro- 
duce. 
At a cost of less than six dollars per acre the author 
constructed a mile of eight and ten inch cement tile 
drain on his “ Vetchfalfa Farm,” and the larger portion 
of same was of ten inch tile placed at an average depth 
of six feet in order to secure an outlet. 
This system of drainage installed by the author con- 
sists of one main line or outlet of ten inch tile, running 
through the center of the farm nearly one-half mile in 
length, with manholes provided with iron tops with open- 
ings for admission of water and air. Laterals are run 
out from both sides of the main line to the outer bound- 
ary lines of the farm and brought up to the surface of 
the ground close up to the fences and the opening 
screened to keep out trash or animals. 
This method of tile drainage construction enables a 
surplus of water to quickly pass away and affords a per- 
