described by Berzelius, for blowpipe experiments; a little of the salt,
glass, or other substance, was melted on this ring by the ordinary
blowpipe, or even in some cases by the oxy-hydrogen blowpipe, and when the
drop, retained in its place by the ring, was thoroughly hot and fluid, a
platina wire from the opposite pole of the battery was made to touch it,
and the effects observed.

402. The following are various substances, taken from very different
classes chemically considered, which are subject to this law. The list
might, no doubt, be enormously extended; but I have not had time to do more
than confirm the law by a sufficient number of instances.

First, _water_.

Amongst _oxides_;--potassa, protoxide of lead, glass of antimony, protoxide
of antimony, oxide of bismuth.

_Chlorides_ of potassium, sodium, barium, strontium, calcium, magnesium,
manganese, zinc, copper (proto-), lead, tin (proto-), antimony, silver.

_Iodides_ of potassium, zinc and lead, protiodide of tin, periodide of
mercury; _fluoride_ of potassium; _cyanide_ of potassium; _sulpho-cyanide_
of potassium.

_Salts._ Chlorate of potassa; nitrates of potassa, soda, baryta, strontia,
lead, copper, and silver; sulphates of soda and lead, proto-sulphate of
mercury; phosphates of potassa, soda, lead, copper, phosphoric glass or
acid phosphate of lime; carbonates of potassa and soda, mingled and
separate; borax, borate of lead, per-borate of tin; chromate of potassa,
bi-chromate of potassa, chromate of lead; acetate of potassa.