This section of the book is from the "Household Companion: The Model CookBook" book
Add to paste, ink, mucilage, or other substance liable to mold, a little carbolic acid. An ounce of this acid to a gallon of whitewash will keep cellars and dairies from the disagreeable odor which is apt to taint milk or meat in such places.
To preserve glasses of jelly from mold, lay on the top of the jelly a piece of paraffine, and let it melt and spread over it. Or the paraffine can be melted and poured over the jelly when cold. This renders unnecessary brandy-paper or other covering.