Mildew, whether on the stems of the wheat, or on the leaves of the chrysanthemum, pea, rose, or peach, appears in the form of minute fungi, the roots of which penetrate the pores of the epidermis, rob the plant of its juices, and interrupt its respiration. There seems to me every reason to believe that the fungus is communicated to the plants from the soil. Every specimen of these fungi emits annually myriads of minute seeds, and these are wafted over the soil by every wind, vegetating and reproducing seed, if they have happened to be deposited in a favourable place, or remaining until the following spring without germinating. These fungi have the power of spreading also by stooling or throwing out offsets. They are never absent from a sod, and at some period of its growth are annually to be found upon the plants liable to their inroads. They are more observed in cold, damp, muggy seasons, because such seasons are peculiarly favourable to the growth of all fungi. The best of all cures is a weak solution of common salt and water sprinkled over the foliage of the plant affected by the aid of a painter's brush, or impelled by a syringe. Dissolve three ounces of the salt in each gallon of water, and repeat the application on two or three successive days, applying it during the evening.

Nitre has been employed with similar success, using one ounce to each gallon. Uredo rosae, Puccinia rosae, and Cladosproium herbarum, are the mildew fungi of the rose tree: Oidium crysiphoides of the peach tree; and Erysiphe communis of the pea. Of course there arc many others.