306 THE HOUSE FLY—DISEASE CARRIER 
attack in campaigns of prevention against many of the 
communicable diseases.* 
Among the obstacles in progress in farm sanitation 
one of the chief has been the difficulty of convincing 
the farmer that the benefits which would accrue from 
proper disposal of excreta would justify the expense 
of constructing, and the disagreeable labor of main¬ 
taining, the sanitary devices proposed. Therefore, 
whatever can be done in simplification and in lessen¬ 
ing expense and labor in the installation and mainte¬ 
nance of an efficient disposal system will increase the 
chances of its adoption. 
The apparatus described in this note has been in use 
in one of the work rooms of the Hygienic Laboratory 
since July 12, 1910. It has been seen by a number of 
sanitarians from different sections of the country, and 
several of them have expressed a desire to test it for 
themselves. The details of construction are presented 
at this time in order to place them at the disposal of any 
persons who may desire to test the apparatus in ques¬ 
tion. 
Starting point of studies .—Starting out on the prin¬ 
ciple that the forces of nature in fermentation should, 
if possible, be utilized, we have sought to meet the ob¬ 
jections that have thus far occurred to us in respect to 
the wet system. Further, the importance of economy 
and of simplicity of construction has been constantly 
held in mind. An effort has also been made to reduce 
*Freeman, Allen W., The Farm the Next Point of Attack in 
Sanitary Progress. Jour. A. M. A., August 27, 1910. 
