A PICTURE IS WORTH 1,000 WORDS,

but the one I am looking for is worth at least a million. It is a photo from the air showing a pentagon of grass surrounded by the Sahel desert. The owner divided the pentagon into five triangles (with apexes at the center) and let his cattle graze in only one partition while the other four recovered, thus preventing overgrazing. The surroundings are desert¾caused, at least in part, by lack of well defined property rights and hence the inevitable overgrazing of land that belongs to "everybody" in the tribe. This is the way the Indian reservations were overgrazed in America, as was, presumably, the Holy Land (once "a land of milk and honey").

As I remember¾and I may be wrong¾I saw the photo in the American Scientist in the mid-70s, but many hours of search have yielded nothing. Can any reader help? I would like to reprint that million-word photo with the caption "Private property, the environment's best friend."