Part 48

Opuſc. Vol. II, page 112.

Footnote 53:

Lavoiſier, Mem. de l’Acad. de Paris.

Footnote 54:

Opusc. vol. II. page 275.

Footnote 55:

The degrees of heat here expreſſed, are according to Farenheit’s ſcale.

By ſaturating phlogiſton, Profeſſor Bergman means to expreſs the proportionate quantities taken away from each metallic ſubſtance, when diſſolved by means of acids, and of courſe reduced to a calciform ſtate. The laſt column only expreſſes their attractions to this part of their phlogiſton, not to that which ſtill remains united to them in a calciform ſtate. W.

Footnote 56:

Opuſc. Vol. II. page 374–376.

Footnote 57:

Diſſertatio de quantitate Phlogiſti in diverſis metallis.

Footnote 58:

Opuſc. chem. vol. II, page 411.

Footnote 59:

Opuſc. chem. Vol. II, page 413.

Footnote 60:

From ſome late experiments made upon platina by the Count de SIKENGEN, and publiſhed in German by profeſſor Succow, it appears that the ſpecific gravity of pure platina is 21,000. When perfectly pure and in its metallic ſtate it was not calcined by deflagration with nitre, it did not admit of being hardened or ſoftened by tempering, like ſteel or other metals; it was drawn into a wire ¹⁄₁₉₄₀ of a line in diameter; this wire admitted of being flattened, and had more ſtrength than a wire of gold or ſilver of the ſame ſize. This platina is not fuſible by the ſtrongeſt fire, but melts in the focus of a burning glaſs; its colour white, ſhining like fine ſilver.

From conſidering the very intereſting experiments of the Count de Sikengen, I apprehend the following method to obtain pure and malleable platina will be found a good one.

Diſſolve the grains of native platina that are leaſt magnetic, in aqua regia. Precipitate the iron by means of phlogiſticated fixed alkaly. Then precipitate whatever elſe will fall, by cauſtic vegetable alkaly. Saturate the liquor with cauſtic foſſil alkaly, and ſet it by to chryſtallize. The yellow chryſtals thus obtained are to be hammered together at a welding heat, and the metallic parts will unite. W.

Footnote 61:

Opuſc. chem. vol. II, page 181.

Footnote 62:

Phil. Tranſ.

Footnote 63:

This reference is not to be found in the Engliſh edition of Cronſtedt. I imagine it ſhould be § 174. 6. where it is called the Dal Falertz. W.

Footnote 64:

In this reference too I ſuſpect a miſtake. It ought I believe to be 173, 6. W.