1912. 



PUBLIC DOCUMENT — No. 31. 



219 



Table X. — Total Nitrogen in Bog Waters, Filtered, 1911. 



(Parts in 100,000.) 



In 1910 total nitrogen was determined in the waters from 

 all the bogs on September 12, at the time of maximum total 

 solids. The 29 samples of that date averaged 3.260 parts 

 nitrogen in 100,000 parts of water, or practically like the 

 average for 1911 in the unfiltered water. 



A few determinations of phosphoric acid and potash were 

 made in 1911 in the unfiltered waters. Samples were taken 

 from bogs receiving fertilizers and from those without. The 

 results were too nearly alike to justify any statements about the 

 two groups, and only averages will be used to show the com- 

 position of the bog water. Eighteen samples representing 7 

 pairs of bogs contained an average of 1.772 parts of phosphoric 

 acid in 100,000 parts of water. Sixteen samples representing 

 6 pairs of bogs contained an average of 5.15 parts of potash 

 in 100,000 parts of water. A few analyses of filtered samples 

 showed that the potassium compounds in the water were com- 

 pletely soluble and passed through the filters with the water; 

 but practically all the phosphoric acid in the imfiltered water 

 was removed by the filter with the slime. Since the slime when 

 burned showed marked evidence of iron in the residue, it is 

 probable that any phosphoric acid which dissolves in the bog 



