Acts especially upon the ganglionic nervous system, and through it upon the glandular and mucous tissue, having a depressing and atonizing influence, impairing their reproductive energies, and producing functional embarrassment, atrophy, and even total destruction of the part. So, also, in some instances of glandular action, notably upon the thyroid, do we find the loss of reproductive and functional power resulting in cellular hypertrophy, the gland assuming the proportions of a morbid growth, due to the same causes as will at other times produce atrophy. The glandular action of Iodine is more especially centered upon the thyroid, the mesenteric, the mammae, ovaries, and testicles. Of the mucous membranes, its action is most prominent upon that of the respiratory tract. The leading expression of the drug is emaciation, both local and general, which accompanies nearly all Iodine conditions. Characteristic symptoms.