a semi-metal, first described by Mr Cronstedt in the Swedish Memoirs for the years 1751 and 1754. The properties there attributed to it are:

1. That it is of a white colour, inclining to red. 2. Its texture is solid, and shining in its fractures. 3. Its specific gravity is to that of water as 8500 to 1000. 4. It is considerably fixed in the fire. 5. It is calcinable, and its calx is green. 6. This calx is not very fusible; but it nevertheless tinges glaas of a transparent reddish brown, or jacinth colour. 7. It dissolves in aquafortis, aqua regia, and marine acid, but difficulty in vitriolic acid. All these solutions have a deep-green colour. 8. The vitriol formed of it is also of the same colour; and the colcothar of this vitriol, and also the precipitates from the solutions, are rendered by calcination of a light-green colour. 9. These precipitates are soluble by spirit of sal ammoniac, and the solution has a blue colour. But no copper can be produced by a reduction of the precipitates. 10. It strongly attracts sulphur. 11. It unites with all metallic substances, excepting silver, quicksilver, and zinc. Its attraction to regulus of cobalt is the strongest, next to which is that to iron, and then to arsenic. 12. It retains its phlogiston a long time in the fire, and its calx is reducible by a very small quantity of inflammable matter. It requires, however, a strong red heat before it can be fused, and melts a little sooner, or as soon as gold or copper. Nickel is contained in the reddish-yellow mineral, called Kupfer-nickel, which, besides nickel, contains also iron, regulus of cobalt, arsenic, and sulphur.