Huff: RESPONSE OF MICRO-ORGANISMS TO COPPER SULPHATE 425 



3. With the conditions under which the treatments were made, 

 a treatment of one part of copper sulphate in 10,000,000 parts of 

 water remains effective for about five weeks, after which time the 

 organisms present, or many of them at least, seem to find conditions 

 favorable for their growth and reproduction, and if the treatment is 

 not repeated at this time they may increase again with remarkable 

 rapidity. 



LITERATURE CITED 



1. Moore, G. T., and Kellerman, K. F. A Method of Destroying or 

 Preventing the Growth of Algae and Certain Pathogenic Bacteria 

 in Water Supplies, U. S. Department of Agriculture, Bureau of 

 Plant Industry, Bulletin 64, 1904. Also, Copper as an Algicide 

 and Disinfectant in Water Supplies, U. S. Department of Agri- 

 culture, Bureau of Plant Industry, Bulletin 76, 1905. 



2. Journal of the New England Water Works Association, 19 : 582. 

 1905. 



3. Caird, J. M. Copper Sulphate Treatment for Algae at Middle- 

 town, New York. Also, Copper Sulphate Results, in Proceed- 

 ings of American Water Works Association, 249. 1906. 



4. Love joy, W. N. Filter Troubles caused by Micro-Organisms at 

 Louisville, Engineering Record, 62 : 664. 1910. 



5. West, G. S. The British Freshwater Algae, 264. 1904. 



6. Marsson, M. The Significance of Flora and Fauna in Maintain- 

 ing the Purity of Natural Waters, translated by Emil Kuichling 

 in Engineering News, 66:246. August 31, 1911. 



7. Karsten, G. Ueber farblose Diatomeen, Flora, 89:404. 1901. 



8. Whipple, G. C. The Microscopy of Drinking Water, 169. 1914. 



