PLATE 6 
A. —Some of same lot laid 1910. Taken up 1918. About one-quarter of tile dis¬ 
carded; remainder relaid. Samples taken up 1921. No. i, bottom of tile in deep 
peat. No. 2, top of tile in deep peat. No. 3 taken from feet deep in mineral soil. 
Seepage line, but carried peat waters. This portion of line had not been relaid since 
1910. 
B. —Ei^ht-inch tile from line in peat northwest of St. Peter. Laid in 1919. Taken 
up after eight months. Second set, relaid in 1920, showed signs of heavy disintegration 
in September, 1921. 
