The Remedies used.

A great many chemicals and chemical compounds have been tried in combating the numerous pests. Gradually the most effective ones have been determined, and the large and confusing number of washes reduced, so that now only nine need be mentioned—kerosene emulsion, resin washes, arsenite washes, hellebore, sulphide of soda, sulphur lime and salt, Bordeaux mixture, ammonio-carbonate of copper, and sulphate-of-iron solution.