124 



Kansas Academy of Science. 



Quantity of Copper Sulphate required to kill various forms of odor-pro- 

 ducing organisms. 



Expressed in pounds per million gallons of water. 



Anabfena . 75 



Asterionella 0.80 



Cladophora 8.30 



Clathrocystis 0.8 



Conferva 3.3 to 16.0 



Chlamydomonas 4.2 



Dinobryon 2.5 



Draparnaldia 2.5 



Euglena 8.3 



Fragilaria 2.1 



Navicula 0.6 



Oscillatoria 0.8 to 3.3 



Spirogyra 0.4 to 2.5 



Ulothrix 1.7 



Immediately following the killing off of the algse by CuSO^ 

 the odor often increases for a few days because of disintegra- 

 tion, but this soon passes away. Another effect of the disin- 

 tegration of the algse is the perceptible increase in the bacterial 

 count. This can be kept down by the proper use of hypo- 

 chlorite. 



Aeration also has a marked effect in the decrease of the 

 algse, by liberating the carbon dioxide gas which is essential 

 to these plants for the manufacture of their food. Then, too, 

 the odors of the algae are liberated by this treatment. Many 

 of the superintendents of the southern part of Kansas use the 

 aerating system to free the water of the sulphur odor. A few- 

 workers have reported a ready removal of certain kinds of 

 algse from drinking water by direct oxidation with ozone, 

 but from a practical point of view this method has never been 

 developed. 



We have in Kansas forty-three surface water supplies whose 

 water is analyzed at the water and sewage laboratory of the 

 State Board of Health at Lawrence once a week. This made it 

 an easy matter for the writter to obtain samples of "moss" and 

 algse from the reservoirs at any time. Collections were made in 

 the summer and winter of 1915 and the spring, summer and 

 winter of 1916. This checking of each reservoir five times 

 should bring out any changes due to differences in the seasons 

 and give a more complete record on the flora of each reservoir. 



The bottles used in collecting the algse were large-mouthed, 

 glass-stoppered, 100 cc. bottles, usually filled about one-half 

 full of a 2 percent solution of formaline. Most of the analyses 

 were made from preserved material. However, one complete 

 analysis was made from each town on the living material, 

 which was shipped into the laboratory on ice, and allowed 

 to grow in aquaria. 



