APPENDIX V 309 



fecal matter then floats free into the water. We are 

 now working on an improvement whereby the rod will 

 connect with the automatically closing lid, and the anti- 

 splashing board will rise and sink as the lid is opened 

 and closed. 



Although some of the fecal matter floats, it is pro- 

 tected both from fly breeding and fly feeding in the 

 following ways : First, by the automatically closing lid ; 

 second, by the water; third, by the film of oil; and, 

 fourth, for additional safety, the apparatus should be 

 located in a screened place. The film of oil also pre- 

 vents the breeding of mosquitoes in the barrel. Ac- 

 cordingly, so far as the privy as a breeding or feed- 

 ing place for flies and mosquitoes is concerned, the 

 model in question completely solves the problem. 



The fecal material becomes fermented in the water 

 and gradually liquefies; the addition of excreta natu- 

 rally raises the level of the liquid, and the excess flows 

 into the efiluent tank, where it is protected from in- 

 sects by the cover and by the film of oil. This effluent 

 may be allowed to collect in the tank until it reaches the 

 level of the connecting pipe, when it may be safely dis- 

 posed of in various ways to be discussed later. 



From July T2th to October 26th there have been 

 246 defecations (with urination) into the model in 

 question, making about two and one-third defecations 

 a day. The effluent has amounted to about twelve gal- 

 lons of manageable fluid. It has not been found neces- 

 sary to add water to the liquefying barrel since the ap- 

 paratus was put into operation. 



