Mr. Wm. Saunders of London, Ontario, in the proceedings of the Royal Society of Canada, tells us that the cabbage butterfly (Pieris rapae), which has proved such a pest to the market gardener, made its first appearance in this country, at Quebec, during the period of the American civil war, and is supposed to have been brought over with fresh vegetables, supplied to the British troops sent to Canada at the time of the Trent difficulty. The insect has since spread over an immense area and multiplied enormously. It now extends from the Gulf of St. Lawrence, all through the Eastern and Middle States, as far west as Nebraska and South to the Gulf of Mexico.