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Aerial Bubbles

Take a stone, or any heavy substance, and putting it in a large glass

with water, place it in the receiver. The air being exhausted, the

spring of that which is in the pores of the solid body, by expanding

the particles, will make them rise on its surface in numberless

globules, which resemble the pearly drops of dew on the tops of the

grass. The effect ceases when the air is let into the receiver.