Lugol's iodine solution, the tincture of iodine, and iodide of potassium, all have medical uses; but not, as a rule, in 512 domestic practice. We may except, perhaps, the outward application of tincture of iodine, which may be painted upon the chest (with a large camel's-hair pencil) for a continual cough (chronic bronchitis), or may be used as a counter-irritant in several other kinds of cases.

Physicians prescribe iodine in Lugol's solution as an alternative in scrofula and in goitre (which see hereafter). Dose, ten drops, twice or thirce daily, in water. Iodide of potassium is a very important medicine in a number of diseases; most particularly and certainly useful in constitutional syphilis, and especially of all in syphilitic rheumatism; also, in anuerism of the aorta. Dose, from five to twenty grains, dissolved in water, thrice daily.