PLATE 2 
A. —Concrete tile laid near Madison, Wis., in 1914; taken up in 1920. No. i has 
not been in the ground. Nos. 2 and 3 were laid 3^ feet deep in peat. No. 4 was in 
silt loam overlain by 2 feet of peat. 
B. —Concrete tile laid in recent soil high in lime in 1916; taken up in 1920. No. i 
was in peat carrying a high percentage of alluvial matter and getting high ground 
wash. No. 2 was at the outlet of a drain in 4 feet of peat. No. 3 was in 4.% feet of 
peat overlying sand. • 
39363—23-5 
