372 



BOTANICAL GAZETTE 



[NOVEMBER 



Determinations of the amount of solid matter and of the re- 

 quired oxygen on a few samples of water from other Puget 

 Sound bogs gave results lying within the limits of the values 

 reported for samples 3,4, and 5. While only one analysis of Lake 

 Washington water is here shown, the junior author has made 

 frequent analyses of lake water in this region and has found them 

 consistent with the analysis here given for Lake Washington 

 water. 



In table III the values in column i are an average of those in 

 columns 2, 3, and 4 of table II. The values in column 2 are the 

 same as those in column 6 of table II. 



TABLE III 



Comparison of bog water and lake water 



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 



(bog) 



2-53 



0.855 



0.301 



0.008 



0.043 



0.963 



23.400 



95.400 



70 . 900 



2 

 (lake) 



0.0834 

 o. 200 

 O. 108 

 o . 0002 

 0.06 

 2.70 



7-55 

 65.00 

 20.00 



FouLK (7) has made two analyses of Ohio bog water. A period 

 of two years elapsed between the time of taking the two samples, 

 which were from the same bog. The two analyses differ consider- 

 ably, but both agree with the ones here reported in showing a 

 large oxygen requirement and a large loss on ignition. 



Several samples of Puget Sound bog water were evaporated to 

 dryness in porcelain dishes on a water bath. A dark brown pow- 

 dery residue was obtained. Other samples were evaporated to 

 dryness in a porcelain dish heated over a Bunsen burner and 

 protected only by a thin piece of asbestos and wire gauze. The 

 residue so obtained was of the same appearance as that from the 

 water bath evaporation. Some of the residue from the water 

 bath evaporation was heated to redness in a porcelain dish. 

 It gave no protein odor as it burned. The biuret test for protein 



