216 



EXPERIMENT STATION. 



[Jan. 



of to the surface of the bogs. The rainfall was scanty during 

 the summer, and frequent additions of water were necessary 

 to maintain the water level within 14 to IG inches of the sur- 

 face. Beginning in the latter part of August, and continuing 

 throughout September and October, frequent rains, some very 

 heavy, caused copious percolation and resulted in considerable 

 overflow from the drainage cylinders. Numerous samples were 

 collected during this period and form the second group already 

 mentioned. About two-thirds of these samples were analyzed 

 after subsidence of sediment without filtration, and one-third 

 were filtered through porcelain filter tubes under a pressure of 

 40 to 45 pounds per square inch. The character and appearance 

 of the samples were like those of the jMay group. They were 

 inky in color until filtered, and were then transparent and of 

 varying shades of coffee color. The amount of solids was re- 

 markably uniform and a little higher in the unfiltered water 

 than was found in ]\lay, but much lower than the figures ob- 

 tained the previous year. It is pretty conclusive that the peat 

 had now become a stable bog soil, and the bog water had reached 

 a stage of equilibrium with its soil environment. 



Table VI. — Organic Solids in Bog Waters, Unfiltered, 1911. 



[Parts in 100,000.] 



