Our American Cousin, by Tom Taylor, Act II, Scene 2:
Enter, from R. 2 E., SIR E., MRS. M., … two servants in livery, carrying tray and glasses, a wine basket containing four bottles to represent champagne, knife to cut strings, some powerful acid in one bottle for ASA—pop sure. (p. 31, Samuel French ed.)
What in Fox’s name is meant by pop sure? And, unless I missed something, that bottle of acid is never used.