Hot as it was, they tested it in a crucible with all the proper reagents. Water did nothing. Hydrochloric acid was the same. Nitric acid and even aqua regia merely hissed and spattered against its torrid invulnerability. Ammi had difficulty in recalling all these things, but recognized some solvents as I mentioned them in the usual order of use. There were am monia and caustic soda, alcohol and ether, nauseous carbon disulphide and a dozen others; but although the weight grew steadily less as time passed, and the fragment seemed to be slightly cooling, there was no change in the solvents to show that they had attacked the substance at all. It was a metal, though, beyond a doubt. It was magnetic, for one thing; and after its immersion in the acid solvents