It has been often recorded in our magazine that it is the hygrometrical condition, conjointly with the thermometrical, that decides the hardiness of plants in most cases where the tissues do not burst by the freezing of their liquids, for in many cases vegetable tissue contracts instead of expands under the action of frost. The Gardener's Record, of Dublin, furnishes the following instance: " At Ballygiblin, near Mallow, the seat of Sir Henry Becher, Bart., there is a plant of Pimelea decussata growing in the open air. It has stood in the same situation for the past four years, and has never received the slightest protection during winter. It is in perfect health, and produces its flowers freely in the month of June each year. It is in a very sheltered position, but, nevertheless, it has withstood some 14 deg. of frost." In our dry atmosphere the plant would be destroyed by the first light frost.