EFFECTIVE MALARIA CONTROL IN RICEFIELD DISTRICT: WITH OBSERVATIONS ON EXPERIMENTAL MOSQUITO FLIGHTS

In a previous publication, 1 there was given in detail the endemicity of malaria in two rice districts, one in Louisiana and one in Arkansas. In the Arkansas district, known as the Extracantonment Zone, Ebert's Field, and including the town of Lonoke, various intensive control methods have been used continuously during the year 1918. LOCATION The field is located about one-fourth mile west of the western limits of Lonoke, a town with a population of approximately 1,500. The field was located in an area used during 1917 for the cultivation of rice, and the area to the west and south is now used exclusively for rice cultivation. TOPOGRAPHY The entire area is flat with very slight slopes toward the streams and the divides undetermined. The top soil is what is commonly called gumbo, underlaid at a depth of 2 or 3 feet with an impervious clay stratum. Owing to the