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Correspondence

August 27,1953

Editor American Journal of Tropical Medicine and Hygiene Berkeley 4, California

Sir:

The last sentence, first paragraph, on page 570 of my article in the July 1953 issue of the Journal contains the following error:

The statement that "the sanitary engineer whose main interest is in progress had better stay at home" should have been: "the sanitary engineer whose main interest is in process had better stay at home."

Were I writing this article today I would modify my statement on the same page that night soil is almost universally used for crop fertilization in rural Asia. Such use of night soil is the prevailing practice in some countries; in others adjoining croplands are the community defecation grounds, with resultant benefit to crops, but this is not exactly a night-soil practice.

Thank you.

Yours truly, JOHN M. HENDERSON