Chapter D: D. Margraaf, Weigleb

Footnote 20:

Opuſc. chem. vol. II. p. 368.

Footnote 21:

MARGRAAF Opuſc.

Footnote 22:

CAVENDISH Phil. Trans. 1767.

Footnote 23:

Dr. Home, in his eſſay on bleaching, ſays it is found in coal mines in
this iſland, and a friend aſſures me that he has obtained it from the
water iſſuing out of coal pits. W.

Footnote 24:

As volatile alkaly may be obtained in large quantities from pit coal,
and produced by proceſſes not dependant upon putrefaction, there is
reaſon to believe that the vitriolic ammoniac may be formed in ſeveral
ways not noticed by the author. W.

Footnote 25:

Acta Stockh. 1772.

Footnote 26:

From ſome experiments lately made I found that both tinkal and
purified borax, required twice their weight of ſedative ſalt, to
neutralize them perfectly ſo that they would no longer change
vegetable blues to a green. W.

Footnote 27:

Baumé mem. des ſc. etr. tom. iv.

Footnote 28:

Phil. Tranſ. 1767.

Footnote 29:

HENCHEL Betheſda port.

Footnote 30:

BOMARE Dictionaire.

Footnote 31:

I have lately diſcovered a ſpecimen of TERRA PONDEROSA _aerata_ got
out of a mine in this kingdom. It is very pure, and in a large maſs.
As this ſubſtance is a new acquiſition to mineralogy, and may be
turned to uſeful purpoſes in Chemiſtry, I intend ſhortly to preſent a
more particular account of it to the Royal Society. W.

Footnote 32:

Conf. Præl. SCHEFFERI, § 188, not. 2.

Footnote 33:

Margraaf Kl. Schrift. tom. II. p. 191.

Footnote 34:

I found it in conſiderable quantity in the Nevil Holt water, when I
analyzed it ſix years ago; and it is probable that the Ballycaſtle
water in Ireland, likewiſe contains it. W.

Footnote 35:

In the original the word is MAGNESIUM, but it is here changed, by the
advice of Dr. Swediar and the concurrence of profeſſor Bergman to
MANGANESIUM, in order to prevent confuſion from its ſimilarity to
Magneſia. W.

Footnote 36:

Mr. MONNET de aquis mineralibus.

Footnote 37:

Opusc. chem. vol. I. p. 394–399.

Footnote 38:

The author ſpeaks here of ſuch as he obtained by precipitation from
acids, but the _native_ TERRA PONDEROSA _aerata_ (ſee note at page 28)
has a ſpecific gravity of nearly 4, 338. W.

Footnote 39:

Opuſc. vol. i. p. 21, 398.

Footnote 40:

N. Acta Upſ. Vol. II. page 198.

Footnote 41:

Opuſc. chem. vol. I, page 23.

Footnote 42:

Opuſc. chem. vol. I, page 398.

Footnote 43:

Opuſc. chem. vol. II. p. 29, 373.

Footnote 44:

Profeſſor _Bergman_ does not here ſeem to be ſufficiently aware of the
difference between our Devonſhire pipe clay, and that which is uſed in
the manufacture of porcelain. The former, in an open fire, burns to a
blueiſh grey, or pidgeon colour; the latter remains white. The former
ſeems to be the ſame as the Cologne and Maeſtricht pipe clay, of
Cronſtedt, §78; the latter is a decayed Feldſpath, and conſequently,
according to our author, (§ 130) contains magneſia. Our porcelain
clay, likewiſe, has quartz, chryſtals, and mica mixed with it, parts
of the granite which it originally compoſed. Before it is uſed the
quartz is ſeparated, but the mica remains. I am indebted to my friend
Mr. Watt for theſe obſervations. W.

Footnote 45:

I have taken the liberty to add this ſpecies upon our author’s own
authority. See BERGMAN Diff. de Lithomarga, page 13.

Footnote 46:

N. Acta Upſal. vol. III, page 121.

Footnote 47:

Opuſc. vol. I, page 291, 292.

Footnote 48:

It is probable, that in another edition, the author may ſee reaſon to
ſeparate the _mica_ from the _talc_; as ſome experiments I have made,
though yet too imperfect for publication, ſeem to indicate the
neceſſity of ſuch a meaſure. W.

Footnote 49:

Opuſc. vol. ii. p. 49.

Footnote 50:

Hiſt. des Plantes de la Gujane. 1774.

Footnote 51:

Dr. SWEDIAR lately preſented a paper to the Royal Society, from which
it appears highly probable that Ambergriſe is nothing but the
indurated fæces of the Sperma Ceti whale, who feeds upon the cuttle
fiſh. He has found the beaks of that fiſh intermixed with the
ambergriſe, in the form of black ſpots. W.

Footnote 52:

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.

Footnote 65:

Some late experiments made at Hudſon’s Bay ſeem to prove that
Quickſilver congeals and becomes malleable at 39 degrees below 0. See
Lond. Med. Journal, page 205, for the year 1783. W.

Footnote 66:

When I introduce a new _ſpecies_ I repeat the preceding number, with
the addition of an aſteriſk, rather than break in upon the order of
the author’s numbers. I intend ſhortly to publiſh an exact analyſis of
this ſubſtance. W.

Footnote 67:

Opuſc. chem. vol. II, page 426.

Footnote 68:

Opuſc. vol. II. page 431.

Footnote 69:

Opuſc. chem. vol. II. p. 429.

Footnote 70:

Diſſ. de Analyſi. ferri.

Footnote 71:

Called Sideritis, from its reſemblance to iron. W.

Footnote 72:

Opuſc. chem. vol. II. p. 231.

Footnote 73:

Diſſ. de quantitate phlogiſti in metallis.

Footnote 74:

Opuſc. chem. vol. II, p. 272.

Footnote 75:

Opuſc. chem. vol. II, p. 446.

Footnote 76:

Opuſc. Vol. II, page 309.

Footnote 77:

Some of the ſulphur and alum, ſublimed by the ſubterranean fires near
Bilſton, contain ſiliceous earth. W.

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