RWhitcomb-editor December 1, 2017 Making an impression RWhitcomb-editor December 1, 2017 "Cows at a Watering Hole" (1863 -- red chalk with stumping on paper), by Charles-Francois Daubigny, in the show "The Impressionist From Degas to Toulouse-Lautrec,'' at the Clark Art Institute, Williamstown, Mass., through Jan., 7.