no THE HOUSE FLY— DISEASE CARRIER 



earth or lime. The oil of schiste is a crude petroleum 

 found in Europe. In the number of July 19, 1907, 

 the paper stated that this proceeding had given excel- 

 lent results and that flies had disappeared wherever it 

 had been applied. At the International Congress of 

 Hygiene in Berlin following. Professor Bordas con- 

 firmed the statements of Le Matin, and added that the 

 Governor of Kiaotscheau had obtained excellent re- 

 sults by the oil method. Galli-Valerio (1910), being 

 greatly interested in this matter, wrote to Doctor Dirk- 

 sen, physician to the Government at Tsingtau, and 

 found out that only five liters of the oil of schiste were 

 sent to the Governor by Le Matin, and thinks that the 

 results of work on such a small scale are not at all con- 

 vincing. Experiments made by the writer, however, 

 with the use of kerosene upon horse manure, convince 

 him that it will act equally well in privies, and in this 

 statement he has the endorsement of Stiles and others. 



A Compulsory Sanitary Privy Law 



The following paragraphs, quoted from Stiles 

 (1910), excellently express some very sound ideas on 

 this subject. 



"A compulsory sanitary privy law or ordinance 

 should exist and be strictly enforced in all localities in 

 which connection with a sewer system is not enforced. 



''Since, from a sanitary point of view, the privy is 

 a public structure in that it influences public health, it 

 seems wisest to have city and town ordinances which 

 provide for a licensing of all privies, the license being 



