310 THE HOUSE FLY— DISEASE CARRIER 



Although the period in question included the hottest 

 part of summer, the odor, when compared with that of 

 the average privy, has been negligible. 



It is thus seen that this device appears to meet the 

 following requirements : 



1. It solves the fly and mosquito problems, so far 

 as the privy is concerned. 



2. It liquefies fecal matter and reduces its volume 

 so that it may be safely disposed of more easily and 

 cheaply than night-soil. 



4. It reduces odor. 



4. It reduces the labor of cleaning the privy and 

 makes this work less disagreeable. 



5. It is of simple and inexpensive construction. 



The effect of the fermentative changes in the ap- 

 paratus upon the viability of typhoid bacilli and hook- 

 worm eggs has not been determined, but other experi- 

 ments tend to show that under such conditions the vast 

 majority of typhoid bacilli and of hookworm eggs in- 

 troduced would die within six weeks' to two months' 

 time. While the time of storage can be prolonged ac- 

 cording to the capacity of vessels provided for the pur- 

 pose, we believe at present that it is safer and more 

 practical not to depend upon storage alone to destroy 

 infectious organisms in the effluent, but to consider the 

 effluent infectious and to dispose of it accordingly. 



Disposal of effluent. — ( i ) Heat : If a suitable (metal- 

 lic) vessel is provided to receive the effluent, a fire may 

 be built under the vessel and the effluent heated to boil- 

 ing. Or if a wooden or concrete effluent tank is used. 



