This section of the book is from the "Household Companion: The Family Doctor" book
Mix a tablespoonful or rather more with a little cold water, till it becomes smooth and pasty. Boil a pint of water, stir in the arrow-root, and boil it for a few minutes, until it thickens sufficiently. Sweeten to taste with white sugar, unless salt be preferred. A little lemon-peel or orange-peel added before boiling will improve the flavor.