30 



Kansas Academy of Science. 



1903 not 19 



1903 /ycrt l^u:> •J"" -^"- .^.^^ .^-^ 



^- UNFILTERED-—\- FILTERED 



0..i5mxVV 



and have developed a bacterial efficiency of over 99 per cent. 

 The supply of water, which is often muddy and always con- 

 taminated with sewage, is taken from the Hudson river about 

 four miles below Troy. After treatment the water is cleai, 

 sparkling and wholesome. The effect of filtered water on the 



