Vegetable Air-bubbles
Put a small branch of the tree with its leaves, or part of a small
plant, in a vessel of water, and, placing the vessel in the receiver,
exhaust the air.
When the pressure of the external air is taken off, the spring of that
contained in the air-vessels of the plant, by expanding the particles,
will make them rise from the orifices of all the vessels for a long
time together, and produce a most beautiful appearance.