A solution (1 part in 500) of sulphide of potassium, sprinkled on the tree by means of a hand-syringe, is extensively used in France.

Celery, Propagation of. -A deep trench should first be dug, at the bottom of which a layer of sticks of wood, say 6 in. thick, should be placed a drain-pipe being placed endwise upon one or both ends of the Layer. The sticks should be then covered with about a foot of rich mould, wherein the plants should be set in a row, and about 5 in. apart. The plants should be well watered, the water being supplied through the drain-pipes, so that, passing through the layer of sticks, which serves as a conduit, the water is supplied to the roots of the plants. In earthing up, care should be exercised to close the stems of the plant well together with the hand, so that no mould can get between them. The earthing process should be performed sufficiently frequently to keep the mould nearly level with the leaves of the outside stems. If these directions are carefully observed, the plant may be grown at least 4 ft. in length, and this without impairing the flavor.