Part 18 (2/2)

Aanese anese

iron iron

lead lead

tin tin

cobalt cobalt

copper copper

nickel nickel

arsenic arsenic

bismuth bisold gold

platina platina

And by the dry way, Argill Fluat of argill

_Note_--These combinations were entirely unknown to the old chemists, and consequently have no names in the old nomenclature--A

SECT XXI--_Observations upon the Fluoric Acid, and its Combinations_

Fluoric exists ready formed by Nature in the fluoric spars[42], combined with calcareous earth, so as to fored from that combination, fluor spar, or fluat of lime, is put into a leaden retort, with a proper quantity of sulphuric acid, a recipient likewise of lead, half full of water, is adapted, and fire is applied to the retort The sulphuric acid, froreater affinity, expels the fluoric acid which passes over and is absorbed by the water in the receiver As fluoric acid is naturally in the gasseous form in the ordinary temperature, we can receive it in a pneued to employ metallic vessels in this process, because fluoric acid dissolves glass and silicious earth, and even renders these bodies volatile, carrying theasseous forraff for our first acquaintance with this acid, though, as he could never procure it free from combination with a considerable quantity of silicious earth, he was ignorant of its being an acid sui generis The Duke de Liancourt, under the nae of its properties; and Mr Scheele see is to endeavour to discover the nature of the fluoric radical, of which we cannot hitherto form any ideas, as the acid does not appear to have been decomposed in any experiment It is only by ht to be made with this vieith any probability of success

TABLE _of the Combinations of Boracic Acid, with the Salifiable Bases, in the Order of Affinity_

_Bases_ _Neutral Salts_

Linesia

Potash potash

Soda soda

Ammoniac ammoniac

Oxyd of zinc zinc

iron iron

lead lead

tin tin

cobalt cobalt

copper copper

nickel nickel

ill

_Note_--Most of these combinations were neither known nor named by the old chemists The boracic acid was formerly called _sedative salt_, and its coetable alkali, &c--A

SECT XXII--_Observations upon Boracic Add and its Combinations_