1912. 



PUBLIC DOCUMENT — No. 31. 



21^ 



solids wlieu compared with tlic corresponding figures for the 

 uufiltered water. 



Table IV. ^ — Average Composition of Bog Waters, Mag 10-12, 1011. 



Organic Solids. 



Inorganic Solids. 



Unfiltered, 

 Filtered, 



63.0 



38.8 



48.0 

 34.0 



The behavior of the samples in filtering, their opaqne appear- 

 ance before it, and the lower solids compared with the results of 

 the previous season, point toward a saturation of the water in 

 the bogs by the soluble material in the soil. 



On June 2 chemical fertilizers were added to 22 of the 30 

 bogs, and the bogs were renumbered in pairs; lA, IB to 15 A, 

 15B, and each cylinder of a pair was a duplicate of the other. 



Table V. — Scheme for Fertilizers on Bogs, 1911. 



Note. — Area of bogs, Vi4.ooo of an acre. 



After the fertilizers were added all irrigation of the bogs 

 was executed by adding water to the drainage cylinders instead 



