S₁: What soda-water is composed of you may see for yourself if you watch your glass as it stands on the table after you have slaked your first thirst.

S₆: ‘Carbonic acid’ is the old name for it, but it is more correct to name it, when it is out of the water, ‘Carbon dioxide’.

P: The liquid is plain water, as you will find out if you are too slow about drinking.

Q: You will see that it is separating into two different things, a liquid and a gas.

R: The gas is so heavy that you can fairly drink it from the glass, and it has, as you know, a tingle-tangle taste.

S: The other is a heavy, sour and invisible gas that slips up through the water in little bubbles and collects in the empty half of the glass.

The proper sequence should be:

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