SANITARY PLUMBING 285 



flies lay their eggs. The flies carry disease germs into the 

 house and contaminate food. If a neighborhood did not 

 feed the flies, there would be no flies. 



The drainage from the toilets, and even from the kitchen 

 sink, should be taken care of in the best possible way. Cess- 

 pools are not very satisfactory under the best conditions, as 

 the seepage may go where it will do harm. The septic tank 

 system, wherein bacteria change the material into substances 

 which are harmless, is the best, where there is no regular 

 system of drainage. See next section. 



Personal cleanliness is a part of sanitary living. Bedrooms 

 should "be well ventilated and closets for clothes should have 

 windows in them. Sunshine is the greatest germ killer known, 

 and every room should have as much sunshine as possible. 

 References : 



1. 1702 : 361-362. Sanitary Conditions. 



2. 1710 : 74-78. Drinking Water and Disease. 



3. 1901 : 151-154. A Sanitary Ice Chest. 



4. 1901 : 253-254. General Rules of Sanitation. 



5. Bureau of Animal Industry, Circular 158. Production of 



Market Milk. 



a. 1502 : 473-475. Sanitation in School. 



6. 1505 : 23-26. Bathing and Clothing. 



c. 1505 : 162-164. Protection against Disease. 



d. 1506 : 187-189. The Bath. Clothing and Health. 



e. 1507 : 244-248. Care of the Skin and Clothing. 

 /. 1509 : 207-208. Necessity for Cleanliness. 



g. 1511 : 288-297. Care of the Skin. Bathing. 



h. 1904 : 187-192. Practical Sanitation. 



i. 1905 : 64-72. The Care of the School Building. 



207. SANITARY PLUMBING 



In the olden times, when people first used pipes to conduct 

 waste water from their houses, they employed straight pipes; 



