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, 19 10. 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, igio. 



