SANITATION 399 



the quantity of liquid specified above. The size can be 

 increased in any direction. Economical construction would 

 require that a tank should be increased, ordinarily, in length 

 after the inside dimensions are over 4 feet in width and 4 

 feet in depth. The deeper tank requires more expensive 

 excavation, and a wider tank makes it more difficult to sup- 

 port the top. 



SUMMARY 



As soon as a tank is completed it should be used, and in a 

 short time the bacteria will be working. In the course of a 

 few weeks it will be giving efficient service. Acids of any 

 kind should not be permitted to enter the tank, as they 

 destroy the bacteria. Around creameries care should be 

 taken not to pour liquid that contains acid into any of the 

 drains that flow into the tank. Drains which carry acids 

 should be connected with the outlet of the tank at a lower 

 point. If these rules are complied with, the septic tank will 

 be found satisfactory for the ordinary family. It is a much 

 more sanitary method ; of disposing of the waste from the 

 house than any other method that has yet been devised, and 

 prevents much injurious matter from being carried into 

 the streams or filtered downward into the soil, where it is 

 likely to cause disease by polluting the water supply. 



BIBLIOGRAPHY 



Ashley, Burton J. Ashley System of Sewage Disposal. Ashley 

 House Sewage Disposal Co., 11112 South Hoyne Ave., Chicago. 



Concrete Septic Tanks. Portland Cement Association, in W. Wash- 

 ington Street, Chicago. 



Erf, Oscar. "Disposal of Dairy and Farm Sewage and Water- 

 Supply," Bulletin 143, 1907, Kansas Agricultural Experiment 

 Station. 



Farm Water Supplies. Minnesota State Board of Health, St. Paul. 



Cameron Septic Tank Co. The Septic Tank System of Sewage Dis- 

 posal. Cameron Septic Tank, Co., Chicago. 



Farrington, E. H., and Davis, G. J., Jr. "The Disposal of Creamery 

 Sewage," Bulletin 245, Wisconsin Agricultural Experiment Station, 

 Madison. 



