"Burt" wants to know if he understands the Gardeners' Monthly to teach that it is because of the exhaustion of potash in the soil, that peaches have the disease known as the yellows? We do not know how this correspondent got such an idea that the Gardeners' Monthly "teaches" any such doctrine. Our magazine may have given simply as an item of news that some investigators have come to some such conclusion; but the Gardeners' Monthly knows very well that in feld-spathic soils, which contain an inexhaustible supply of potash, the disease is as prevalent as in any other soils. Our correspondents must learn to distinguish mere "news" from "teachings".