iqiq] 



RIGG b- THOMPSON— BOG WATER 



371 



the colloidal state of the toxic material is. Six samples of water 

 were collected for analysis. The usual precautions recommended 

 for the sampling of waters were rigidly followed. The locali- 

 ties were as follows: (i) the swamp adjoining Henry bog, (2) a 

 point approximately in the center of Henry bog some 800 or 

 900 ft. from the edge of the swamp, (3) a point in West Mud 

 Lake bog about 600 ft. from its edge, (4) another point in 

 the same bog about 500 ft. from where sample 3 was obtained, 

 (5) a very narrow strip of swamp land lying between the points 

 where samples 3 and 4 were obtained, (6) a few inches under the 

 surface of Lake Washington, a short distance from shore, where 

 the water was about 30 ft. deep. These samples are referred to 

 in table II by these numbers. 



TABLE II 

 •Analysis of waters from swamps, bogs, and lakes 



Constituents 



Total organic nitrogen 



Nitrogen as albuminoid ammonia 



Nitrogen as free ammonia 



Nitrogen as nitrites 



Nitrogen as nitrates 



Chlorine 



Oxygen required 



Total solids 



Loss on ignition 



2 . 



O. 



O. 



O. 



O 



O 



16, 



107 



64 



31 



500 



175 



012 



030 



702 



40 



00 



00 



0.834 



0.20 



o. 108 



0.0002 



0.06 



2.70 



7-SS 

 65.00 

 20.00 



Sample i possessed a strong earthy odor and a Kght straw 

 color. It was collected so close to the edge of the bog as to be 

 considerably influenced by the character of the water of the bog. 

 Sample 2 had a very shght odor, and its color was much deeper 

 than that of sample i. Samples 3, 4, and 5 all possessed a sHght 

 earthy odor and had a hght straw color. Sample 6 was perfectly 

 clear and had no odor. Samples i and 2 were collected February 

 20, 1917; samples 3, 4, and 5 were collected March 13, 1917; 

 sample 6 was taken during the spring of 191 7. The various con- 

 stituents of the waters examined were determined according to 

 the methods given in "Standard methods for the examination 

 of water and sewage," used by the American Health Association. 



