evaporated liquid, which contained the sulphate of alumina, was thrown away.
Cyrus Harding had now at his disposal a large quantity of these sulphate of iron crystals, from which the sulphuric acid had to be extracted. The making of sulphuric acid is a very expensive manufacture. Considerable works are necessary—a special set of tools, an apparatus of platina, leaden chambers, unassailable by the acid, and in which the transformation is performed, etc. The engineer had none of these at his disposal, but he knew that, in Bohemia especially, sulphuric acid is manufactured by very simple means, which have also the advantage of producing it to a superior degree of concentration. It is thus that the acid known under the name of Nordhausen acid is made.
To obtain sulphuric acid, Cyrus Harding had only one operation to make, to calcine the sulphate of iron crystals in a close vase, so that the sulphuric acid should distill in vapor, which vapor, by condensation, would produce the acid.
The crystals were placed in pots, and the heat from the furnace would distill the sulphuric acid. The operation was successfully completed, and on the 2Oth of May, twelve days after commencing it, the engineer was the possessor of the agent which later he hoped to use in so many different ways.
Now, why did he wish for this agent? Simply to produce azotic acid; and that was easy, since saltpetre, attacked by sulphuric acid, gives this acid by distillation.
But, after all, how was he going to employ this azotic acid? His companions were still ignorant of this, for he had not informed them of the result at which he aimed.
However, the engineer had nearly accomplished his purpose, and by a last operation he would procure the substance which had given so much trouble.
Taking some azotic acid, he mixed it with glycerine, which had been previously concentrated by evaporation, subjected to the water-bath, and he obtained, without even employing a refrigerant mixture, several pints of an oily yellow mixture.
This last operation Cyrus Harding had made alone, in a retired place, at a distance from the Chimneys, for he feared the danger of an explosion, and when he showed a
