Folio 42

[
in this way [far] less alkalescence . . The earths of [ali]
that I have tried separate fluorine from Pitassia
even silica . Oxide of Iron agitated with [flurite]
of [Potissa] renders it alkaline - from [The tunnic] acid
To try to distile the [peculiar] acid [ xxxx xxxxx ]
of This dissolved in water & likewise from
the acid from Barioxirode by Sulphuric acid .
To make & also the compound of fluorine
& iodine & also. the compound of chlorine

]

Fluorine

Symbol/formula: F

Carl Scheele’s investigations into fluorspar showed that it was a compound of calcium and an unidentified acid, capable of dissolving glass, released when fluorspar reacted with sulphuric acid. The unidentified substance was first shown to be an element in 1810 by André-Marie Ampère, and subsequently proven by Davy. The element came to be named fluorine through its commonly-known compound of fluorspar.

Silex

Symbol/formula: SiO2

Silica, an oxide of silicon.

Iron oxide

Symbol/formula: Fe2O3

Oxide of iron. A dark red solid which occurs as the mineral haematite and as the main component of rust.

Oil of vitriol

Symbol/formula: H2SO4

Sulphuric acid. A mineral acid composed of the elements sulphur, oxygen, and hydrogen.

Iodine

Symbol/formula: I

Chlorine gas

Symbol/formula: Cl

Davy named chlorine in 1810 and insisted it was an element and not a compound.