Here he does not wash his glass at all; for the strength of the vinegar must alter what is left of the complexion of the Brazil water, which he took in the morning before he appeared on the stage.
You are always to remember, that in the interim, he will commonly drink up four or five glasses of the luke-warm water, the better to provoke his stomach to a disgorgement, if the first rouse will not serve turn.
He will now (for on every disgorge he will bring you forth a new colour), he will now present you with white wine.

Here also he will not wash his glass, which (according to the vinegar in which it was washed) will give it a colour like it.

You are to understand, that when he gives you the colour of so many wines, he never washes the glass, but at his first evacuation, the strength of the vinegar being no wise compatible with the colour of the Brazil water.
Having performed this task, he will then give you a show of rose-water; and this indeed, he does so cunningly, that it is not the show of rose-water, but rose-water itself.

If you observe him, you will find that either behind the pail where his luke-warm water is, or behind the basket in which his glasses are, he will have on purpose a glass of rose-water prepared for him.

After he has taken it, he will make the spectators believe that he drank nothing but the luke-warm water out of the pail; but he saves the rose-water in the glass, and holding his hand in an indirect way, the people believe, observing the water dropping from his fingers, that it is nothing but the water out of the pail.