Melt one pound of lard with a very gentle heat in a bottle or glass flask plunged into warm water; then add half an ounce of phosphorus, and one pint of proof spirit; cork the bottle securely, and as it cools shake it frequently, so as to mix the phosphorus uniformly; when cold pour off the spirit (which may be preserved for the same purpose), and thicken the mixture with flour. Small portions of this mixture may be placed near the rat holes, and being luminous in the dark, it attracts them, is eaten greedily, and is certainly fatal. N. B.- There is no danger of fire from its use.