Attention is now being directed to the condition of the roots of sickly-looking trees, and it is found that much disease exists there which is unsuspected; hence the just remark that you should know as much about the condition of the roots as that of the limbs. A white mycelium often displaces the bark of many of the fibres; the microscope shows that the roots are entirely overrun with delicate, transparent threads which invade the young parts, sometimes forming a white felt, quite concealing the surface. This apparently unintelligible disease is a most dangerous enemy in old cropped grounds, and should be carefully looked after. Probably there will be found a remedy either in sulphur or charcoal.

Wheat Mildew was formerly believed to proceed from the common Berberry, but Dr. Lindley proves this to be an error.

"Subsoil Irrigation is a tried, lasting, and substantial application of art," says the Cottage Gardener, "in perfect unison with nature, in the shape of a system of cultivation which, in connection with agriculture, by means of which the great labor attached to watering gardens may be almost entirely dispensed with." If not too expensive, we agree with the writer, and give his modus operandi as follows: -

"In the formation of beds on this system, it will be necessary in the first place to 'dig out the earth from one to two feet deep, so as to be able to form a bottom nearly watertight, with sides about four feet six inches high, to prevent the liquid from running over until the earth has been moistened by it. The bottom may be of clay and chalk, or gravel, or lime, or any hard substance rammed; and upon the bottom put one row of half-drain tiles in the centre (that is to say, in the centre of beds three feet in width; or, if six feet, two rows), and loose, not jointed. There is an admission pipe sloping at one end to each rank of drain tiles, and a pipe at the other end of the bed to see when the liquid stands at four inches, and then to stop. The earth is then filled in as before, and proceeded with as in ordinary gardening. Water, or liquid manure, on being poured into the pipes, will pass along the whole length of the beds; and rising through the small spaces between the drain-pipes, partly by the capillary attraction of the mould, and partly by the attractive power of the roots themselves, will feed and nourish the plants.' So writes Mr. Wilkinson, the able promulgator of this new system of cultivation, in his pamphlet on subsoil irrigation; and that it does nourish and greatly increase the size and produce of roots, vegetables, Ac., is an undeniable fact; and that it may be applied with equal advantage to the flower garden is sufficiently obvious." The system is patented in England.