lime.
Barytes barytes barytes.
Magnesia magnesia magnesia.
Potash potash potash.
Soda soda soda.
Ammoniac ammoniac ammoniac.
Argill argill argill.
Oxyds of(A)
zinc zinc zinc.
iron iron iron.
manganese manganese manganese.
cobalt cobalt cobalt.
nickel nickel nickel.
lead lead lead.
tin tin tin.
copper copper copper.
bismuth bismuth bismuth.
antimony antimony antimony.
arsenic arsenic arsenic.
mercury mercury mercury.
silver silver silver.
gold gold gold.
platina platina platina.

[Note A: The existence of metallic phosphites supposes that metals are
susceptible of solution in phosphoric acid at different degrees of
oxygenation, which is not yet ascertained.--A.]

[Note B: All the phosphites were unknown till lately, and consequently
have not hitherto received names.--A.]

[Note C: The greater part of the phosphats were only discovered of late,
and have not yet been named.--A.]

SECT. XVI.--_Observations upon Phosphorous and Phosphoric Acids, and
their Combinations._

Under the article Phosphorus, Part II. Sect. X. we have already given a
history of the discovery of that singular substance, with some
observations upon the mode of its existence in vegetable and animal
bodies. The best method of obtaining this acid in a state of purity is
by burning well purified phosphorus under bell-glasses, moistened on the
inside with distilled water; during combustion it absorbs twice and a
half its weight of oxygen; so that 100 parts of phosphoric acid is
composed of 28-1/2 parts of phosphorus united to 71-1/2 parts of oxygen.
This acid may be obtained concrete, in form of white flakes, which
greedily attract the moisture of the air, by burning phosphorus in a dry
glass over mercury.

To obtain phosphorous acid, which is phosphorus less oxygenated than in
the state of phosphoric acid, the phosphorus must be burnt by a very
slow spo