The Images page "Down From the Hills to Buy and Sell," Aug. 16, on market day in Ecuador, is a beautiful compilation of words and pictures. The photo of the Saquisili market is so rich in color and character. It's a prize-winner! Hats off to the photographer and the staff that made it possible.Kathleen Schaefer, San Antonio Letters are welcome. Only a selection can be published, subject to condensation, and none acknowledged. Please address them to "Readers Write," One Norway St., Boston, MA 02115.