Metallic Copper is of very little use to the gardener save for making hghtning conductors for his greenhouses, or in the form of wire for renewing the fuses in his electric lighting or heating mstallation Its compounds, however, form an important class, chiefly as fungicides, though the sulphate has been used as a fertiliser for lawns when added in extremely small quantities to lawn sands. In the copper compounds we have poisonous materials the use of which still requires much experiment, but it is believed that in this element there exists a cure for that fell disease Clubroot if a suitably mild material could be produced at a cheap rate. If applied to the soil, copper must be used in the remotest of small quantities, as up to now it has served to injure rooting rather than to encourage it. As regards the compounds. Copper Carbonate, Copper Chloride, Copper Oxide, and Copper Phosphate have never yet come to the fore horticulturally, hence it is needless to give details concerning them here. COPPER ACETATE.This is not of much use to the gardener, though its basic salt popularly known as Verdigris is sometimes used as an ingredient for indelible ink. COPPER ACETO-ARSENITE. This is usually a bright green solid, and is used to a certain extent as a fungicide. It is the chief ingredient in Paris Green (see article on Insect Pests : General Methods of Destruction). COPPER ARSENATE. This has been suggested as a cure for Wart Disease of Potatoes, and also as a general fungicide. Unfortunately its use has not so far been satisfactory, and no striking results have been obtained. It has undoubted possibilities, however, and experiments with it should be carefully watched. COPPER NITRATE.This is a chemical with a future before it in horticultureof that there can be little doubt. It is suggested that it could be prepared cheaply by adding a solution of Calcium Nitrate (see article on Lime Compounds) to a strong solution of Copper Sulphate. This last is very cheap, as most gardeners know. Experiments with the present compoiind as a cure for clubroot and other diseases are, we understand, in progress, but it is too soon to say with any certainty that it fulfils what is hoped. COPPER SULPHATE. This, popularly known as Blue Stone, is the most important copper compound, and is largely used for the making of Bordeaux and Burgundy Mixtures, and as an ingredient in indelible ink. Its use in the former capacity is described in our article on Spraying Mixtures and Fungicides, while the latter use is briefly referred to in our notes on Ink in the article on Garden Labels.E.
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