XIII. The supposed effect of boiling upon water, in disposing it to freeze more readily, ascertained by experiments. By Joseph Black, M.D. Professor of Chemistry at Edinburgh, in a letter to Sir John Pringle, Bart. F. R. S

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Abstract
Dear Sir, We had lately one day of a calm and clear frost; and I immediately seized the opportunity, which I missed before, to make some experiments relative to the freezing of boiled water, in comparison with that of water not boiled. I ordered some water to be boiled in the tea kettle four hours. I then filled with it a Florentine flask, and immediately applyed snow to the flask until I cooled it to 48° of Fahrenheit, the temperature of some unboiled water which stood in my study in a bottle; then putting four ounces of boiled, and four of the unboiled water, separately, into two equal tea cups, I exposed them on the surface of a north window, where a thermometer pointed to 29°. The consequence was, that ice appeared first upon the boiled water; and this, in several repetitions of the experiment, with the same boiled water, some of which were made nine hours after it was poured out of the kettle.

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