54 



This laboratory is provided with desks, water, gas, etc., and may be 

 considered a well-equipped laborii,tory. The desks are Hi feet high 

 and 4 feet wide, with drawers and cupboards on both sides and water 

 and gas cocks in the center. The apparatus is designed to record 

 soil temperatures (tig. 8), to take 

 samples of soils (tig. 9), to deter- 

 mine soil moisture (PI. XI, tig. 1), 

 and to test a number of prop- 

 erties of different soils, for in- 

 stance, the water-holding power 

 of loose and compact soils, the 

 rate of percolation of air through 

 soils, and certain other physical 

 properties, some of the apparatus 

 for which was designed l)y Pro- 

 fessor (jibbs, formerly of the Ohio 

 State University. 



About 60 acres of land are used 

 for purposes of instruction, al- 

 though other land used forexperi- 



i^iG. 9 —Soil-sampling apparatus; A, lioUow steel sampling tube, i inch internal diameter, 45 inches 

 long, marked every 3 inches; B, solid steel rod, 46^ inches long, which closely fits A; 0, ejector; 

 D, driving head for sampling tube; E, aluminum cans for soil samples; F, case for sample cans. 



mentation may also be considered as a part of the instructional 

 equipment (PL XI, iig. 2). Forty acres are divided into su])tields of 

 exactly 5 acres each. These fields are not fenced, but are divided l\y 

 roadways, the land occupied by which is not a part of the 5-acre tracts, 



