III. The liquefaction and solidification of argon

Having been furnished, by Professor Ramsay’s kindness, with a sample of the new gas, argon, I have carried out experiments on its behaviour at low temperatures and at high pressures, in order to contribute, at least in part, to the knowledge of the properties of this interesting body. The argon with which I was supplied had been dried with phosphoric anhydride; its density was 19⋅9 (H = 1); and Professor Ramsay thought that at the outside it might contain 1 to 2 per cent. of nitrogen, although it showed no nitrogen spectrum when examined in a Pflücker’s tube.