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Forbid azotic acid to boil at the freezing temperature, and command water to boil at zero.

Pertaining to azote, or nitrogen; formed or consisting of azote; nitric; as, azotic gas; azotic acid.

They contain a small quantity of carbonic acid gas, and also of azotic gas; some sulphate of soda, and muriate of soda; selenite, carbonate of lime; siliceous earth; and a portion of oxyd of iron.

Now, Harding having sulphuric acid at his disposal, had already been easily able to produce azotic acid by attacking the saltpetre with which nature supplied him.

The other faces of the cube or cylinder of copper used are coated, and the copper placed in a bath of azotic acid.