Birds began to circle in brief flights; cloud shadows fell clear-cut on the west, dark flank of the mountain; and in the saturated marshy spots, where a scummy green growth already was spread over the crystal pools of the little hillside springs, frogs were exultant.
"Sisters"
Kathleen Norris
The inside of her mouth felt scummy.
"Si'Wren of the Patriarchs"
Roland Cheney
Our voluble but ununderstandable guide invited us by urgent gestures to test its efficacy, but the water looked scummy and dirty, and we declined.
"The Charm of Ireland"
Burton Egbert Stevenson