Honey-Dew, or Suffusia mellita, a sweet substance found on the leaves of oak, hazle-nut, hops, and other plants 5 and which has been erroneously supposed to fall from the sky.

According to Dr. Darwin, the honey-dew is a saccharine juice that exudes from trees, in consequence of the retrograde motions of the cutaneous lymphatic vessels connected with the umbilical, or with the common sap-vessels of plants; instead of being carried forward to increase the growth of the present leaf-buds, or to accu-mulate nutriment for the buds, which are in an embryon state.

This exudation is consequently-very injurious to the trees which are subject to it ; especially from its great sweetness, which' attracts immense numbers of bees and ants: no method of preventing it has hitherto been discovered.

Honey-Dew is very detrimental to fruit-trees, from its vis-cousquality ; because it closes their pores- and impedes their perspira-tion-Mr. Forsyth therefore di-rects those trees, which are most liable to such distemper, to be sprinkled with a mixture of lime-water and urine ; after which they should be washed with the liquid, stated in the article Blight (p. 399, of this Supplement). These remedies, however, ought to be applied early in the morning; in order that the trees may become dry, before the solar rays produce intense heat; as, otherwise, the blossoms and leaves are apt to be scorched, and thus to be materially injured.