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Observations on the Automatic Distribution of Paris Green¹

This report discusses the automatic distribution of Paris green for control of Anopheles breeding along irrigation canal banks. Two modifications of the original automatic Paris green distributor are described. One is an improved machine for using Paris green diluted with dust, such as powdered charcoal. The other is for dustless Paris green in a water suspension.

The modified machine for distribution of dust was given thorough field trials and performed satisfactorily, with effective larva control. The other machine had fewer trials but seemed to function well.

Received May 14, 1942.
¹ These studies were made under the auspices and with the support of the International Health Division of The Rockfeller Foundation, cooperating with the Madras Health Department, and the Pasteur Institute of Southern India. The authors are indebted to N. R. Sitapathy, assistant engineer, for his collaboration.