771. _Galvanism a Protector of Trees._--A German journal states that the application of galvanism has been made in Austria for preserving trees and plants from the ravages of insects. The process is very simple, consisting only in placing two rings, one of copper, the other of zinc, attached together, around the tree or plant. Any insect that touches the copper receives an electric shock, which kills it or causes it to fall to the ground. 772. _Moss on Trees._--The following is an excellent application to the scraped trunk to prevent the growth of moss, and destroy eggs of insects. One gallon of soft soap, one pound of flour of sulphur, and one quart of salt, to be well stirred together and put on with a hard brush. 773. _To destroy Caterpillars in Gooseberry Trees._--Gather dust from any turnpike road, and shake it well among the trees, and the caterpillars will immediately fall to the ground. It is an excellent plan to dust the trees twice or three times a week, as it will effectually prevent the lodgment of caterpillars. 774. _A neat method of Grafting._--Prepare the stock and the graft in the same way as for grafting with clay in the common way. Then take a long slip of India-rubber, three-quarters of an inch broad, and about the thickness of a shilling. Tie one end of this elastic riband with a thread, well prepared by rubbing with shoemakers' wax, to the stock, a little below where it is cut for being joined to the graft; then make the joint as neatly as possible, and wrap it round with the riband, taking due care to keep the India-rubber fully stretched, and to make it overlap at each turn fully one-half of the breadth of the previous round, till the whole is covered, then tie the top with a thread in the same manner as at the bottom, and the operation is finished. After grafting the trees in the manner described, nothing is done to them till they are completely set, when the India-rubber slips are taken off to be ready again for the next year. When opened up, there is scarcely any appearance of a joint, and altogether they are much neater than when done with clay. 775. _To Kill Vermin on Plants._--Tobacco water is much used for the above purposes; it is made by pouring a gallon of boiling water upon a pound of tobacco leaves, and straining it in twenty minutes. Or, syringe the plants with this mixture: put into a jar five gallons of spring water and four ounces of chloride of lime, to which add four ounces of vitriol; when the lime is precipitated, pour off the clear solution, and keep it air-tight. Or, mix coal tar and water, and sprinkle it over the infected plants.