Place diluted grape juice or red-colored water into upper compartment of bottle. Have just enough to fill three glasses three-quarters full. Put the two shells over bottle with openings together at rear so that glass can be gripped through them.
You can have bottle, glasses, and covers on a tray and have them brought in and placed on table. Or you can have things arranged on table beforehand. If you have three stands, arrange them in a triangle with a glass on each of the front stands and bottle at rear point of triangle. Or you may use a card table for the experiment, placing bottle and glasses at points shown in Figure 23. Place the three covers at rear of table.
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