Frost Damage. [A late killing frost inspires an account of its destructive effect on various forms of vegetation in southern New Jersey, where Kalm was staying. A Swedish inhabitant had planted an English walnut tree (Juglans regia) now about twelve feet high and in full blossom. The frost had no noticeable effect on the native wild black walnuts, not yet in leaf or blossom, but:] Last night’s frost had killed all the leaves of the European variety. Dr. Franklin told me afterwards that there had been some English walnut trees in Philadelphia which thrived very well for a while, but that they had finally been killed by the frost.