January 16, 1938. Shinyanga, Tanganyika: Government experimental farm. Looking down the slope across six of the contour ditches, each one built with a slope of approximately one foot drop in 400 feet, toward the left, where the water is gathered in a collection ditch and carried to the storage tank in the background. Rainfall here is not abundant, but it is very heavy when it comes and the supply must be preserved. c. 5000 feet.