As soon as it froths up stir in milk until thick.
"Joe Tilden's Recipes for Epicures"
Joe Tilden
The carbonic acid, when thus liberated from its union with the lime, escapes in a gaseous form, and froths up or effervesces as it makes its way in small bubbles through the drop of liquid.
"The Student's Elements of Geology"
Sir Charles Lyell
He froths at the mouth whenever he mentions your name to the other prisoners.
"The Gray Phantom's Return"
Herman Landon