Put your mushrooms into water; rub them very clean with a piece of flannel; put them into milk and water, and boil them till they are rather tender. Then pour them into an earthen colander, and pump cold water on them till they are quite cold. Have ready some salt and water; put them into it; let them lie twenty-four hours; then dry them in a cloth. Then put them into a pickle made of the best white wine vinegar, mace, pepper, and nutmeg. If you choose to boil your pickle, it must be quite cold before you put in the mushrooms.