a white light substance, formed on the surface of fluids by vehement agitation, consisting of little spherules or globules.

Froth-Spit, or Cuckoo-Spit, a name given to a white froth, or spume, very common in the spring and first months of summer, on the leaves of certain plants, particularly on those of the common white field-lychnis or catch-fly, thence called by some spitting poppy.

All writers on vegetables have taken notice of this froth, though few have understood the cause or origin of it till of late. It is formed by a little leaping animal, called by some the flea grasshopper; by applying its anus close to the leaf, and discharging thereon a small drop of a white viscous fluid, which, containing some air in it, is soon elevated into a small bubble; before this is well formed, it deposits such another drop; and so on, till it is every way overwhelmed with a quantity of these bubbles, which form the white froth which we see. Within this spume it is seen to acquire four tubercles on its back, wherein the wings are inclosed: these bursting, from a reptile it becomes a winged animal; and thus, rendered perfect, it flies to meet its mate, and propagate its kind. It has an oblong, obtuse body, and a large head with small eyes. The external wings, for it has four, are of a dusky brown colour, marked with two white spots: the head is black. It is a species of Cicada.