The chemistry of Hyposulphurous Acid and the Hyposulphite of Soda has been sufficiently described at pages 43, 129, and 137 of the present Work. The crystallized salt includes five atoms of water of crystallization.
HYPOSULPHITE OF GOLD. See [Gold, Hyposulphite of].
HYPOSULPHITE OF SILVER. See [Silver, Hyposulphite of].
ICELAND MOSS.
Cetraria Islandica.—A species of Lichen found in Iceland and the mountainous parts of Europe; when boiled in water, it first swells up, and then yields a substance which gelatinizes on cooling.
It contains Lichen Starch, a bitter principle soluble in Alcohol, termed "Cetrarine," and common Starch; traces of Gallic Acid and Bitartrate of Potash are also present.
IODINE.
Symbol, I. Atomic weight, 126.
Iodine is chiefly prepared at Glasgow, from kelp, which is the fused ash obtained on burning seaweeds. The waters of the ocean contain minute quantities of the Iodides of Sodium and Magnesium, which are separated and stored up by the growing tissues of the marine plant.